Hi, BlueJay. Sorry you are going through all of these problems. And I thought I had a lengthy list! It could be yet another symptom of the disorders you already have, as you suggested. Are you monitoring your diet? Maybe it's some thing you're eating....
I don't know the longer term effects of exposure to bug spray, but maybe it's possible that could be a factor.
Are you seeing a therapist? Perhaps he/she at least could give you support, too. My goodness, I can't imagine dealing with all those problems on my own. My therapist even gives my exercises to do to help me deal with my pain and other symptoms. Like ways to relax.
At any rate, I hope things get better soon!