Mononeuritis symptoms and conditions

I started full body internal itching after taking 10 days of Singulair. The physician that prescribed it said it couldn't cause itching. My new doctor tested for Lupus, I have an autoimmune disorder called Churg Strauss. After undergoing several steroid treatments and 3 days of IV Prednisone I got some relief. This has been going on for 6 months now. The itching becomes severe enough to make me want to commit suicide. Luckily it is pretty controlled by taking nightly doses of Atarax along with Periactin. Thank God I found a doctor who cared enough to search out the symptoms and help me get thru day by day.