Experiences with Metformin?

Kati
Hi ladies,
I have had 2 miscarriages in the past 6 months and after doing a series of bloodwork, my doctor believes I may have PCOS. She started me on Metformin. Have any of you ladies taken it? How did you feel on it (I feel worse than I did during my 2 pregnancies)? Did it help you get pregnant? 
I've been reading a lot of things about the medication online and some potential side effects are scary (lactic acidosis). 
Please share your advice, your experiences, etc. Thanks!