Sulfamethoxazole-Trimethoprim and doctors

I was diagnosed with strep throat about 1 week ago and at first the doctors tried to kill me! They had prescribed amoxicillin--I am allergic to anything with "cillin" in it, and before heading home, I caught the mistake. The doctor apologized profusely, and then prescribed me erythromycin. Upon taking this drug, my face became swollen, and my eyes were itchy and red and my throat stung and my ears burned like fire! I returned to the doctor's office, and he was like, "oh, well, you're allergic to this, too! I'll give you some Bactrim. It helps for UTI's". I don't have an UTI, but I was desperate for anything to stop the burning pain. After taking Bactrim(sulfamethoxazole trimethoprim) for two days, my throat felt much better and the ear pain was gone, but I had a horrible rash on my chest, arms, back, and face. My eyes became itchy and puffy, and after day six of the treatment, I stopped taking my medicine. I couldn't take the rash or the itchy eyes anymore. Something strange happened: I felt just great! My skin had cleared, and no more itchy, puffy eyes! Now, two days later, I wake up to another sore throat AND itchy, puffy eyes. I do not have insurance, and any treatment I receive comes straight from out my own pocket. Could this stuff be silently killing me? Please someone help me with this strange dilemma