Thank you for your stories. I thought I was feeling symptoms of HIV till I read fellow Bactrim user side effects. I intailly felt like my whole neck was very stiff and maybe sore. I had full range of motion, but felt very unusal. My glands felt slighty swollen, but had no sore throat. My ears, cheeks, and jaw line would feel sore and sometimes go numb or tingle. My appetite was completly desimated and I would have spells of nausea. I took the generic brand of Bactrim and I since have gotten a new prescription. Thannks for all your posts and I will surely check all side effects of drugs from now on!