Itch relief symptoms and conditions

I am on two 500 mg doses of cephalexin daily to help heal a bug bite..Still waiting for the biopsy to come back. Doctor suggested could be a brown spider bite. Definitely want to stop the skin deterioration and get the wound from where the bite was removed healed but the itching started on day 3 on my stomach and has now spread to entire torso, back, insides of arms and legs. I have tried aveeno baths, benadryl (knocks me out) and eucerin itch-relief. Today I coated my entire body with 1% hydrocortisone with little relief. HELP - I am scratching to the point of bleeding and now that I have read these other comments will NOT take another one of these pills. Any other OTC relief anyone has found?

I have been taking 40mg Omeprazole (by APOTEX) for one week. At 3am Saturday 6/20/2009, I woke up with a severe itchy rash from head to foot. Over four hours, I took 125mg of Benadryl, but the rash got worse, At noon, I went to the Emergency Room at UPMC Shady side. They gave me intravenous steroids, but this had no immediate effect, After three more hours, they admitted me to the hospital. It wasn't until almost midnight before I began to have relief. I was discharged the next day. I have been instructed to never take Omeprazole again.

I am taking this for itch relief from a rash but it seems to be making me more anxious rather than less. Anyone have that problem?