Cephalexin Monohydrate and antibiotic

I had a skin infection on my lower legs and was prescribed Cephalexin Monohydrate. I took it for 6 days, 4x per day, then stopped. I was supposed to continue on 2x per day for the next week.
I started itching at the top half of my buttocks and it quickly spread all over my back, chest, shoulders, arms and onto my scalp. Small lumps or hives and red blotchy skin nearly all over my old body. The itching was driving me crazy. I didn't know where to scratch or rub next.
My doctor couldn't see me for another week so I went to see another doctor who prescribed Phenergan (promethazine hydrochloride) tablets and Celestone M (betamethasone) cream.
Relief came within 24 hrs, I went through 4 days of hell and while still itchy on the 5th day, it was getting better. I also used ionil T ( a medicated shampoo ) for my scalp.
I have never been allergic to any drugs before this monster
This antibiotic should come with a warning

Was prescribed cephalexin (Kaiser) for a broken skin infection on my leg from a sporting accident. It was pussing and not healing well. Started taking cephalexin immediately after leaving the pharmacy. Within a couple days, my skin infection was not any better. Hives and bright red dots appeared on my chest, my arms, and my legs. Itching was intense - I couldn't sleep - would wake up in the middle of the night totally on fire - but I was told to stay on course by the nurse at the pharmacy and finish the bottle as I wouldn't want an antibiotic from losing its hold on the stronger existing bacteria. The hives, in the form of red patches, bumps, and streaks were visually traveling through my body and hives would break out. I resisted itching. Then one morning I woke up and my entire chest had a huge patch of hives taking up the entire space between both nipples and from the top of the rib cage to the collar bone. It was ridiculous. One week in, I called my doctor and went in for a check up. Instead of prescribing another class of antibiotics, my second doctor (and opinion) opted to stop taking the medicine all together. He determined the hives were an allergy to Cephalexin.

I took this medication seven years ago. After a couple of days I broke out into hives. When the initial Hives went away I kept itching. Then, the itching began to spread all over my body. I have been turned away by many doctors who wished me luck and said they were sorry but they couldn't help me. Since then, I have become a science project for doctors. I have taken a number of medicines to calm me down and an assortment of creams and lotions. One spray that takes the itchy hives away for awhile is CLOBEX. It's very expensive. It costs me $250 a month (out of pocket). The only medicine that relieves the condition for about a week is prednisolone (another drug that's not so great for you). I now take that once a month for one week’s relief. Each night, I have to scold myself in the shower to relieve the itching for a few hours so I can go to sleep. I'm currently at a new Dermatology Clinic. Guess what they prescribed for me? CEPHALEXIN, the drug that caused the poor quality of my life I now have. Doesn't anyone listen to the patient? The only best medical friend I have is my Primary Care Physician who has greatly supported me all these years. I pray that someone may read this and I have an answer me.
If you have not yet taken CEPHALEXIN, think about it long and hard. It's not for everyone and MAY not be for ANYONE. If you've read this far in my note, I consider you a new friend.

Someone please help!!
Still Itching in New Jersey.

joint pain, tired, itchy scalp, swelling of joints....I am being treated for cellulitious, on 4xper day (500mg) for over 60 days now, after major antibiotic drips IV for 5 days every 6 hours.....