I started taking Metformin from about 50 days , I have pcos and secondary amenorrhea (no period from Nov 2001), the first 2 weeks was sooooo bad , I had a very bad diarrhea and stomach pain , vomting , dizziness , but now I am fine , sometimes I have diarrhea but not that bad , after using metformin for a month I got a period and this was a surprise for me and I was soo happy , I hope to ovulate this month!
But if I were you , I will ask my Dr about heart fluttering , but I want to tell you my dear that by time things will be easy
GOOD LUCK