I do not recommend Gabapentin, i'm currently taking it and trying to get myself off of it and I've been experiencing the worst attacks. My heart rate gets up to 130 beats and i've been on it for a year. I came across an article explaining why it isn't a good drug to take as it has bad effects to your brain. getting off it has been causing me the worst panic attacks of my life.
if Pristiq worked and didn't make your more anxious it's possible you're more depressed than anxious -- a lot of anxiety sufferers are primarily depressed. As for gabapentin, my psychiatrist suggested that for me as well because I have an unusual problem caused by medication and she was out of ideas. It is commonly used for anxiety, though that's not its approved use. The only way out of this trap for you is either to find a physiological cause behind all this, such as thyroid problems, etc., or to seek a fix through therapy or other modalities since it appears these meds poop out on you. But yeah, that's a common adjunct drug for anxiety.