Bless your heart, darlin....I'm so sorry you're going thru this and he's going thru this. I don't think there is necessarily a time table for paxil withdrawl...I think it, like anything else, depends on the chemical dependence of the person taking it. It could very well still be affecting him and if he had serious anxiety issues to start with, that certainly could make this worse for him.
Stepping back is the best and really, only thing you can do at this point. Try not to give up. Sending good thoughts your way