WARNING: may be TMI!!! Last night I started taking metformin again,...along with some vitamins. I took them all not too long after I ate. A little bit later I started getting nausea and an awful headache and at times the nausea would get really bad and then I would burp and it would get better for a bit, lol... This morning I barely went pee and it all started again. The headache and nausea are there still but today I've also had some diarrhea... So I'm thinking it's food poisoning, reaction to metformin, or maybe I'm pregnant. I've taken the metformin before and no side effects... do you think the side effects could start now, only two months later?