bacterial vaginitis
"I have gotten bacterial vaginitis a few times over the past few years.  Unlike most, I don't usually experience any odor or discharge.  Instead I just suffer from vaginal pain that is so bad it keeps me awake at night.  I have taken this antibiotic in the past, and it works great - I feel better after just a few doses.  This time around, I got very nauseous after my first dose, and ended up throwing up.  I think because I didn't take it with a real meal (just a small snack) it upset my stomach.  Another possibility is I took a probiotic this morning which says not to take it within 2 hours of taking an antibiotic..."