Sulfamethoxazole and fatique

I was prescribed sulfameth/trimethoprim 800 for my Urine tract infection, 2 tablet/day. After the fifth day, I experienced rash over my whole body and fatique. On the sixth day I got a fever/chill. I suspected it's a reaction from the medicine so I stop taking it. I took 2 Aleve tablet and the fever stop. I went to my family Doc and she said the rash is caused by my allergic to Sulfameth, especially if the body is exposed to the sun. She said it's good that i stop using Sulfameth. the rash should go way after couple day. she pescribed Dytan( anti hystamine) to relieve the rash.

I've been on Sulfameth/Trimethoprim 800/160 to treat a breast lump, and after only one pill taken about 20 hours ago, I am experiencing shakiness, nausia and fatique.

I'll update if these symptoms progress. My mother reassures me it's because i'm not, 'drinking enough water.' but after reading I'm suspecting worse.