I am back on METFORMIN again, after about 2 years without. My initial period did not go so well, as the endo had me start out at a FULL dose of 2 tabs a day, rather than reintroduce gradually. I never took that much before. After I got ill 3 days into the 2 tab a day dose, I stopped, got better, and then tried the more gradual approach, with only 1/2 tab for several days. After a few weeks, I am up to 2 tabs a day.
Funny thing, now my fasting blood sugar is running higher than before, but I am slowly loosing weight again, which I like.