When I first started Lexapro I had some side effects, but those went away within the first week. So it's possible yours may do that, too, but everyone reacts differently.
You should call your psychiatrist and tell him how you're feeling on this. Reporting and questioning side effects is normal, and a good idea.

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Matthew 11:28
Come to me, all you who are weary and burdened, and I will give you rest.</font color=green> Sounds good...