I'm not going to pose as any kind of expert here, because I'm not, but everyone has nightmares, not just us anxious people. From what I've heard and read, nightmares and dreams in general are the brain ridding itself of stored information it doesn't need anymore. But there are obviously other opinions through history about dreams. But I did suggest what you're suggesting, too -- that it might be something that's being worked out, not med related. As a fiction writer, I kind of like dreams, even nightmares, and it's no doubt that these meds do intensify dreams sometimes. But who knows? I've never personally had a panic attack in my sleep, so I don't know, but ever since I started getting phobic, I'm always phobic in my dreams, too, in the situations I'm phobic in real life. I think that's strange, because I know my Mom, before she passed, was paralyzed from the waist down, but in her dreams she could always walk. She used to dream of running on the beach. I think the brain is just weird. As to the poster, because she skipped right from one medication to another, there's no way to know what's withdrawal, what's a side effect from the new med, or anything else. That's a problem with switching meds without completely withdrawing from the old one first, but there are a lot of theories out there in the naked city.
For my info, what do you think about the nightmares? I have had some terrible weird ones when not on meds, so isn't it possible that her experience last night was just pent-up fear and not med related? What I mean is having a panic attack in your sleep is enough to give you a nightmare later.
Also try your pharmacist for emergency info, if it takes a while to see your doc.
Pristiq is Effexor, just the new and improved model. So while it is a different med, it's also very similar to what you were taking, albeit much more expensive since it's not off patent. But that being said, the same thing was done to Celexa in creating Lexipro, and people report very different experiences on the two meds, so Julie is probably right, you're probably suffering some kind of withdrawal or side effect. Quitting Effexor cold turkey is pretty nutso, but maybe the psychiatrist felt switching to Pristiq wouldn't present the withdrawal problem because the two drugs are so similar, Pristiq being basically Effexor with some of the molecule cut away. If this is your only side effect so far, it could also be your brain just shedding some stuff, which is what nightmares are. I would immediately speak to your shrink and ask about quitting Effexor cold turkey and whether Pristiq is in fact considered by anyone other than your shrink a direct substitute for Effexor. Of course, if it is, it's hard to see how it would help you any better than the Effexor, but let's not get logical here. I would also second Julie's suggestion -- wouldn't hurt to ask Dr. Gould, since this is a complicated question given the similarity between the two meds.
Erm for a start your doc shouldn't have taken you straight off of the Effexor, even to change to a diff med, she should have weened you down while introducing another med, this is proberly why your now having the nightmares....
If i were you i would go back to the doc and explain whats happening and she may have to reintroduce the effexor and then come off slowly while the other drug kicks in. Maybe you should also inbox Paxiled who will be able to give you some very good advice. Or put this to the doctors forum, who can give you advice from a fully quaified doc who specialises in the subject Dr Gould.