bacterial infection
"Was prescribed this after a pap showed BV, no symptoms.  The first day was fine, a little tired.  The next two were terrible, I struggled not to fall asleep at work!  And the nausea began, despite taking it right after eating a full meal.  Collapsed from fatigue while getting ready to go to work one morning, and was unable to keep any food down yesterday.  Can't call my doctor to ask what to do as today I only figured out these are side effects of this medication and they're closed on Sundays..."