i've been taking metformin for about three months now and it makes me feel strange. I get a hot feeling my sugar drops fast when I take it and I be cold my heart feels funny I start shaking and feels nerveous when I take it is that normal. I go to the doctor this month and I'm going to let my doctor know as well. mmy legs is even starting to swell I didn't have none of these problems until I started taking metformin