Re: Is this it or part of it..
I guess one way to tell is to ask yourself if you had the swings before you started the Effexor. If you didn't, then it well may be a side effect.
Go back to your doc and go over it with him. Maybe he can find something else that will help without the agitation you describe. It's not unsual for antidepressants to make us manicky.
Welcome to the board, too. There's a lot of help here.
We can relate to you our own experience with meds, but we can't recommend anything. Only your doctor can do that. Lamictal, for me, is a great drug, despite the agitation is causes. I never responded to the SSRI's.
It takes a while to find the right meds, so don't give up. Keep at your doctor until you feel better.