First, congrats on your baby. That's awesome! So, did your doctor want you to go off of the Effexor? I know they do sometimes use antidepressants with pregnant women if the benefits outweigh the risks. Did they wean you off slowly as they should do or did you abruptly stop? That makes a difference as all of these medications should be slowly titrated down with a lower and lower dose over days to complete. If your W/D is really bad, call your doctor and get advice. They may start you on a low dose of the pill and begin weaning you off more slowly.
Can you describe the withdrawal symptoms you're having? Some are more indicative of a long-term problem, some go away fairly quickly. Effexor is a tougher one than most, so Mom is right, I hope you tapered off it slowly enough. It is true that no antidepressant has been determined to be safe for a pregnant woman, but I think the one that is used most with the least concern is Zoloft. But at this point, you probably don't want to risk trying something new that you don't know will work. If it's more than you can handle, the way to deal is to go back on the last dose at which you felt fine and taper off more slowly, but as you're pregnant, you're just in a tougher boat. Talk this out thoroughly with both your psychiatrist and your obstetrician and make the best decision you can. But please do say what exactly the symptoms are -- for example, if you have the "paxil flu" as it's called, that goes away. So tell us which ones you're having.