I have been prescribed Prednisone after I had an adverse reaction...

I have been prescribed Prednisone after I had an adverse reaction to an antibiotic which i was taking after an insect bite became infected. I am covered in a sore extremely itchy rash of weels all over my body. I took 6x5 mg of Presnisone with breakfast and as I was feeling ill because of the rash I took it easy and lay on the sofa suddenly about 60 to 90 minutes after taking the pills I had an overwhelming feel of wanting to be sick and diarrhea, my head was spinning and I came out in a cold sweat. I become very anxious and felt like I would die, so quickly and severely did this come upon me. All I could do was lie down and let it pass. fortunately my husband was at home and I felt reassured that if needed he would ring for emergency treatment. after a while this feeling passed but did return about an hour later. It took about six hours before I could move my head without feeling sick. I spoke to my GP on the phone and he said I shouldn't have had a reaction like that, it was not the usually side effect! Reading the post on this forum I think it most definitely a side effect of Prednisone. Now I have to decide whether to take it again tomorrow I am still very itchy and the rash hasn't got any better but no worse. My GP suggested taking 3x 5mg for breakfast and 3x 5mg with lunch. I only have to hopefully take it for one more day after that. I do feel for those of you who have no choice but to take.