Prescribed Medications

Well, I've started the Celexa ( last couple days) and last night I couldn't get to sleep....actually didn't sleep too well after I got to sleep.   Also, this morning I woke up feeling nervous and jittery.    I also have an upset stomach. 

Is this normal and will this go away soon??? 

This is the part I hate about starting new medications.  I always seem to have the side effects that go along with it. 

Thanks!!

Nan