trichomoniasis
"I was prescribed four 500mg pills to take at one time. My gyno highly recommended that I take them with food, because it would most likely upset my stomach. I weigh 95lbs soaking wet, and I'd never taken antibiotics before, so it seemed like a rather harsh treatment, but I took the medication as directed. 

I took it around 10pm, an hour before I went to sleep. It made me very drowsy right away. I woke up around 5am with the most horrendous nausea imaginable, and I started vomiting an hour later. The nausea and vomiting stayed for a couple of days. I developed a fever and had chills. Other side effects I experienced: stomach cramps, diarrhea, mouth sores, that metallic taste in my mouth, extremely dark urine."