If you're due to see your dr. today, I would definitely tell him what's going on. I can't even imagine a supplement that could add to or countervail the effects of drugs as powerful as Celexa, so I think our layman's attempts at advising about supplementation are futile. This is almost certainly a pharmacological issue (or a physical one--is there possible that there's something wrong physically? That's worth checking out--some medical conditions, like heart disease, can cause extreme anxiety).

Again, please report back and let us know how things go.