I was prescribed amoxicillin and clavulanate potassium 875mg twice a day. I started it a week ago fri for 10 days for a sinus infection. I was already a little nnauseous I continued to take it thinking i hAd a stomach virus. I had diarehha on the second day of taking it so i took 2 immodium. My stomach was constipated for days. Everyday I experienced nausea, so i didnt stop taking the antib. I felt lime i would vomit. As of today, i feel the same. Is it possible its from the antib?