Why do I feel like this?

Madelyn
So I have been on metformin for 6 months, the first month it would make me throw up some days. I'm used to it now, and have missed my night pill every once in a while. I take 2000 mg a day. On April 1st, Friday, I completely forgot to take my metformin, so on the 2nd, I continued my medication. So I am wondering if missing only one day could have made me wake up at 5 am and throw up. I am shaking and while I was asleep I felt like I was half awake the whole time, it was really weird.