Cephalexin Monohydrate and arms and legs

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 was taking 500mg three times a day. After 1 week I developed severe joint pain and swelling in my fingers. I got an itchy rash on the bridge of my nose and over my eyes and inside my nose. The joint pain continued to my knees and toes. I have been off of the medication 3 weeks and I am just starting to feel a little normal. a different doctor put me on 800 mg of Ibupropen 3 times a day and after reading up on the side effects of Cephalexin I began taking Benadryl which has helped a lot.

After Effects When Finished Using Cephalexin
I finished taking Cephalexin a week ago for strep throat and currently I've been feeling a tingling sensation on my arms and legs. Sometimes I get an itchy feeling on my arms. Could this be an after affect??

Thanks