Shelly, I don't have PCOS but I was diagnosed with Type 2 diabetes 7 years ago and put on 500 mg Metformin twice a day. I did not get any bowel problems from it like some people do but I got nauseated quickly when I ate and could only eat very small portions. I quickly lost 20 lbs, which I really needed to lose, but gradually that feeling went away and I gained that weight back. I don't remember how long it took for the nausea to go away, probably a couple months. So, this seems normal to me, unless it never goes away for you.
If I had started this a year ago I would be at goal today!
First Goal - 199 Onederland!
Second Goal - 180
Final Goal - 150