Good move, give it a chance, it is a good med for many, and in the begining of my DX it helped a whole bunch.
It is very smart of you to give it a chance. If it doesn't seem to help after 4-5 weeks, don't just stop it, be in contact with your pdoc, it may be that you will have to switch meds or a dosage adjustment, but don't drop out from being helped. I know it can be extremely frustrating, making one feel they want to call it quits, but please, do not.
I am sending you loads of wishes for good luck and perserverance (sp?) with this all.

Sincerely,
DE