How much are you taking? I take lexapro but when I started i took 10 mg for 2 days then had to cut back to .5 (half a tab) for a couple weeks and then gradually built back up to 10. I had nauseau but it has mostly passed. So it does get better. Eating dry crackers or small meals helps. Also, maybe taking it at night would be better than the morning.

Good luck.