I'm so sorry you're having to deal with this, and at such a joyous time.
I personally did not have pp (or extreme baby blues) after ds was born, but I was warned against it and monitored after he was born because I have a history of pretty bad depression. I've been lucky enough to be feeling pretty darn good though since he's been around (he's 13.5 mo now). I do have some feelings of depression/sadness out of nowhere once in awhile, although it's not nearly often enough to be serious.
How long have you been on the anti depressant? I ask because if you're still feeling pretty low, it might not be the right one for you (depending on length of time on it). But I commend you on trying to take time for yourself, and seeing a counsellor. Sometimes just talking to somebody is a great relief in itself.
Good job on your lo only getting up twice a night! I think at that age I was still waking 3 or 4 times to feed him!