Cephalexin Monohydrate and pills

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?

Took the perscription (500 mg, 2X daily) for three days before I started having bad side effects, then it hit me like a ton of bricks, and I quit immediately. My digestion has been real messed up, my stomach and intestines have felt as though they had a meat grinder turned on inside. My head has felt as though the top of it was going to come off. I've been off the pills for 3 days now and my head is beginning to feel better. My major complaint now is that my legs ache. My thighs mostly, but also my calves some. I had no idea I would get so sick from an antibiotic.

I have the rash after taking only 6 pills or six days. The rash has spread over the upper torso and scalp. I am 31 and this is what I got 5 days after strep. After the dry skin appears it starts to itch. Then you scratch and we will see if it goes away. I am 14 days now with the rash. Infrequent on legs and lower torso. Mainly back, scalp and chest.