Its not psychosamatic. Thats a term used by people with no compassion for this problem and it is a very real problem.
The best way to turn this around is with a healthy diet, colon cleansing and especially liver flushing. This is a sign of toxic overload in your system. It can be undone. Stick around the Curezone and you will learn many things to help with this problem. If you need more info, I can give you more than enough.
A far as your job goes, you need to get a doctor to side with you and this can be tough but not impossible. It must be medically documented. There are doctors who specialize in environmental medicine and are your best bet in this situation. What city are you in?