I was exposed to co. poisoning 19 years ago. it was low to moderate levels for 3 years. I got it from using a floor polisher, fueled by propane with an internal combustion engine. I started with head aches and nose bleeds then very quickly to muscles pain all over. I used graffie remover heavely in the school bathrooms it contained phosgene. I was a school janitor when all this happened. I was 43. I am now 61 and not any better. I've been on opiates for 19 years. they help. could this have anything to do with polymyositis?