Sulfamethoxazole and throught

I was prescribed sulfameth/trimethoprim one week ago to treat a urinary tract infection. For the first four days I seemed to be ok although I was very tired and had a loss of appetite which I thought was due to the infection. On the fifth day, after my second dose I began running a fever. Throught the entire evening I experienced hot and cold flashes. I though that I was coming down with something since I have been working alot lately. The sixth day the fever started early. I felt dizzy, skittish and delirious. Again I was up all night with hot and cold flashes. I was suffering from joint pain and neck pain, red spots appeared all over my body. My eyes also became sore. The glands on the back of my neck and behind my jawbone became extremely swollenOne of my co workers looked at my prescription and told me that I may be allergic to sulfer. Since I was already at the end of the medicine and the infection almost gone I decided to try taking benedryl and tylenol. The fever has stopped as well as the dizziness and delirium. The red spots seem to be going away and I have an appetite again. I still feel a bit tired and my neck is still swollen but I dont' want to start all over again on something else. In the future I will tell my doctor that I am allergic to sulfer and cannot take this medication..