Trimeth symptoms and conditions

I have been taking Sulfameth/Trimeth for a presumed UTI/kidney infection. I was given a 2 per day regimen for 30 days. I am almost half way through and cannot take it anymore. I have experienced nausea, hot flashes (and I am man!), sleeplessness, photosensitivity and now my whole chest cavity and stomach feel raw and inflamed. I do not the diarrhea that others complain about, but I am taking a potent probiotic. The nausea and raw stomach subside when I eat, but that only lasts for a couple of hours max.

My son was given this medication for MRSA staph infection, in addition to Rifampin 300mg, and other medication he has had before. This is his 4th outbreak so they were trying to get aggressive with this treatment.

Yesterday, Day 4 (although he hadn't been taking his medication faithfully as he should have been) he developed a rash on the side of his tummy. Then today, it started spreading sporadically on his back, his knees are red & swollen, and his hands feel swollen to him as well. Since both these medications are new to us, and it's a Sunday, I'm having him stop both the SULFAM / TRIMETH, and the Rifmpkin until I can speak with a doctor tomorrow.

Looks like other people have had similar, and worse side effects such as his.