Kerri- (I spell my name the same way by the way!) have you tried drinking lots of water when taking your pill? Also, make sure you're eating something right before taking a pill. Eating plus combining at least 16oz of water really really helped me w/nausea. I only felt nausea 2x when taking the Met and it was only because I did not eat enough before hand. Also, contrary to what most say about eating carbs when taking Met, you may be cutting too many carbs out. If you do eat carbs, stick to the NO WHITE Carbs rule. I did not drastically reduce my carbs and I was never sick on the Met and I was up to 2000mg/day. The only diarrhea experience for me was when I ate anything deep fried, that was a big NO-NO for me!
I did loose weight on the Met, it was gradual loss not overnight but I'm a thin cyster so I didn't need to loose any. It really does curb your appetite, there were days I just had no desire to eat much of anything. That changed when becoming PG by the way!
Are you a thin cyster?
I also took extra B-12complex vitamins while on the Met and I never got tired like some of the women complain about so I believe they help.
All in all, I always felt great on Met! I just started off very slowly, 2 weeks on 250mg/day, another 2 weeks on 500mg/day, another 2 weeks on 1000mg/day until I was up to 2000mg. 2000mg was the dose that finally got me to ovulate and become preggie.
Good luck TTC on Met! It does work!