Bactrim and nostrils

Hello all, I am feeling the bactrim pain. I came in for a staph infection which turned out to be the pesky MSRA. I have been taking 2 800mg tablets/day for about 5 days until I went back for a check up. My dosage was then doubled and to be continued for another 10 days. Also I was given 8 tablets of 150MG Cleocin because the staph wasn't clearing. All seems fine until about the 10th day of the continuation. I started tingling, iching from the ears then later noticed a rash developing down my arms, and back and chest. Now it is everywhere, even on more severely my legs and knees. Seems also folliculitis(infected hair follicles) are popping up with the hellish itchy red spotty rash that is everywhere. I went to the doctor for the rash today(day 2=much worse than day 1). The Doctor said it was an allergic reaction to the Bactrim. I remembered already asking the doctor from the last visit about 10 days earlier if i should be concerned with any allergic reactions. He laughed and said 'why". Well, this time I was give 10 more days of 4 dosages 300MG of Cleocin for the staph and steroid shot for the rash. Also I have this nose stuff for the staph to put in my nostrils twice/day for 5 days to help kill the staph which resides in my nose. OMG, i itch. I really appreciate all the information given here. It is somewhat comforting. I had just taken some benadryl from reading this forum in hopes of combating the rash. Finally, I can't sleep and just want to cut off all my skin.
Take care all and have a happy life.