bacterial infection
"Bread is the key. I've taken metronidazole 500mg 2 times a day for 7 days. This is my 9th set of themm seeing that I'm prone to BV. Every time I get them I get nauseous, sick headaches, stomach pains, weak and the taste is the worst thing in life. It always hits my tongue or back of throat. I never finsu a bottle I always leave about 3-4 pills because I can never finish and the symptoms clear after about 3 days. Well after my last visit that is why it always comes back you have to take the whole dosage. But it was such a hard pill I never could. Well this time I learned to wrap them in BREAD. Problem solver!!! I wrap it around bread, and just swollow it . its like u never took a pill :) no taste and no headaches no nasuea and I even take it without food sometimes. No symptoms what so ever ! This is a big help in my life. Because ive dealt with this for a year and a half back to back because I have a very sensitive body! Now if I ever need to take them everything is perfectly fine :) I recommend doing that , because I believe the taste is what causes the symptoms.....at least for me . 
-Kyri"