What could have triggered my Autoimmune disease?

Three years after being diagnosed with wegeners vasculitis http://www.vasculitisfoundation.org/wegenersgranulomatosis, I am still wondering and wish I knew exactly what did trigger it.

I was always really healthy (except for growing up next door to an acid company where I lived the first 12 years of my life).  The worst thing that ever happened to me prior to getting wegeners, was getting hit by a car when I was 12 years old.  I rarely went to the doctor and always ate very healthy.  The biggest change in my life before Aug. '06 was getting a hot tub 2 years prior.  I enjoyed it so much, I was in it everyday.
CHEMICAL EXPOSURE #1 - Sitting in chemicals everyday (even though my tub has an ionizer).  I missed the signs.  First I got a bad case of eczema and when I went to the dermatologist he said I was extremely dried out.
With all my research since, I now think my body was detoxing (maybe releasing the acid I was exposed to)? and I did not realize it.  My condition lasted for almost a year that I did not go into the tub.  Then, I got a bad case of shingles on top of the eczema.  My system was crying for help.  I thought of this as an isolated symptom, but in retrospect I believe this was all related to the symptoms that followed.
CHEMICAL EXPOSURE #2,3,4...I should also mention that my 14 year old cat developed a bad case of fleas and I let off a flea bomb, gave him a flea dip, shampooed the carpet with a flea killer, sprinkled flea power here and there, and finished the job by handling a flea collar that I put on him for a week.  After talking to my vet he said it was very toxic and harmful for cats and I removed it.
CHEMICAL EXPOSURE#5  Then my purple leaf sand cherry bush developed a case of bugs that didn't budge when I sprayed it with a lighter less toxic spray, so I sprayed that with something highly effective and very toxic.
CHEMICAL EXPOSURE#6  I was painting in my basement and exposed to those chemicals.  Now, none of these things separately would be a problem, to the average healthy person, I don't think?  But in retrospect, I was overdoing the amount of toxins on a daily basis within a short amount of time.  When you are well, many people do not even think about being exposed to the toxins when driving their brand new car, or moving into their new house, or simply getting new carpet, fresh paint, and new furniture.  Not to mention the thousands of chemicals used in beauty products and common household cleaners we use on a daily basis.
If this topic of Auto Immune triggers interests you, read :The Auto Immune Epidemic" by Donna Jackson Nakazawa .http://www.donnajacksonnakazawa.com/
Very well written and researched, as well as thought provoking and informative.  If you put all the auto immune diseases together as a group, it is the number one killer of Americans today.  It also happens to be the fastest growing set of diseases.
I also wondered about the motrin I took while experiencing the joint pain. Just weeks before ending up in hospital I took a new drug from my rheumatologist called Imobic which immediately made my fingers puffy and inflammed. I also took the anti-biotic augmentin which is questionable based on what the liver doctor at U of M said who was a part of the National Liver study which is still going on.  I went to U of M because cytoxan was destroying my liver.  Funny how the evidence was there on my blood test showing how my liver enzymes climbed to 600 and 700 and the doctor said, I want you to see a liver specialist to see if you should keep taking this or not?  The first liver doctor at Henry Ford hospital kind of laughed that I needed his opinion.  He said immediately, that's a no brainer; NO!  Stop taking it immediately.
My point is, just because products are available and even prescribed to you; use your own discretion.  I had to learn this the hard way.  Just because they have three whole isles of toxic garden pesticides and everyone else washes their hair in chemicals http://www.health-report.co.uk/ingredients-directory.htm,, and eats food with hydrogenated Oils http://www.downwithbasics.com/hydrogenated.html, and uses splenda as a sweetener; doesn't mean it is safe!
CHEMICAL EXPOSURE IN FOOD  As I mentioned, I lived to eat and ate out in many different restaurants around the world.  I may have been exposed to many unhealthy oils, margerine, and ingredients that I would never use in my own cooking.  I may have had a cumulative effect and my system was over saturated and the hot tub was the straw that broke the camels back.
After getting diagnosed in '06, I was getting my haircut and telling my stylist what happened to me (she wondered why I looked as though I had aged 10 years in 2 months),  she told me about one of her clients.  She ended up with lupus and linked http://www.splendaexposed.com/ it to splenda.  I was newly diabetic and my husband bought me several bags of diabetic candy.  I realized after hearing about my stylist's client that these were sweetened with splenda.  What a pity, this hard candy was so delicious and I had to throw it away because splenda can trigger auto immune disease.   I also started researching products like aspartame which have many known side effects.://www.dorway.com/ and are in many drinks that seem healthy.
Since I don't know if any of the abover really were the triggers, I also have to mention that in the summer of 2006, I was also bitten by a tick.  I was on my way to the grand opening of Ikea in Canton, MI, when I pulled a tick out of my arm.  I made a big mistake and threw it out the window. (If you ever are bitten by a tick, keep it and send it into a lab that will check the tick for being a lyme carrier).  My lyme disease blood test came back normal twice, and I probably don't have lyme.  However I developed a bullseye on my arm like the ones shown in pictures. I have personally met people who years later found their health problems
were undetedted lyme disease and it had taken a toll on them.  Their blood test results initially said, no lyme detected according to the Elisa test.  This is the link to do the more reliable test .lymehttp://www.digitalnaturopath.com/treat/T463425.html. 
A special note to my vasculitis friends, I urge you to write down everything you can think of, as I did here, to analyze what you think could have been a trigger to your health crisis?   There is a discussion about this topic on the vasculitis wall you can share your information with us at.  Lets network and see what the common threads are?  I am just as interested in finding the causes as I am the cures.  I believe future generations will not need a cure if we know the causes and make changes to avoid them.