Sulfamethoxazole and tiredness

I started taking Sulfameth for sinus infection and the first day noticed a floating feeling, tired, nauseous, cramping, red blotches on my face. After on;y taking 3 I stopped and now on the 4th day I still have exxtreme tiredness and cramping and a feeling of just not feeling well. I will not take it again.

Hi,

I am now taking sulfameth for a UTI, and this is my second day of taking it. So far, I haven't had any horrible reactions. I did get a very bad stinging type of headache lastnight after the second pill, but since I get migraines often, I didn't blame the medication for it. I am very tired and fatigued, and have no appetite whatsoever, so this might be due to the med, but I have problems with my stomach, so again, I don't want to fully blame the medication for this. As long as it takes care of the UTI, I can deal with the tiredness and no appetite till I'm done taking all of it. I have no reason to go off of it so far.