When I first started with Lexapro, I had nausea for several days. It subsided thereafter. I tolerate it better than other antidepressants. I presently take 20mg and it suits me. I tried backing down to 10 mg..then to 5mg to see if it was really helping. I began having the "100 thoughts dashing thru my brain" at night again. It definitely slows my overactive brain down.
Good luck with it as it definitely has less sexual side effects than most.
Be well