chlamydia infection
"Was diagnosed with chlamydia this morning sadly and was prescribed two 500mg tablets to be taken at once. After about an hour and a half of taking them I got the most excruciating stomach pain I've ever experienced. The pain was so bad I couldn't stand up straight without feeling like I was going to vomit everywhere. It's been about two and a half hours since I took them now and my stomach is starting to calm down, no diarrhea "so far", but if it will get rid of the infection I'm happy."