Metformin

I've been on 1500mg of Metformin every day for the past month and a half because I've had irregular periods and my husband and I are TTC. My doctor told me the side effects usually go away after a little but the nausea, vomiting, and diarrhea still haven't stopped.  Most mornings I wake up extremely nauseous that I need to just lay in bed for about 15-20 minutes until I feel ok enough to start getting ready for the day, and I'm constantly feeling light headed and nauseous thought the day. Any advice on how to deal with these side effects? I'm so tired of just feeling so sick every day : (