Hi jmodge,
I'm going through the exact same thing as you. I feel an impending doom that I just can't pinpoint. Whether it's lack of money or fear of being alone; it's just a generalized terror of the unknown. I'm employed (last time I actually showed up), financially solvent (Ihope), and well educated, but I have these bizarre panic attacks for no seemingly good reason.
I've tried a whole bunch of drug therapies but the only combination that seems to work for me is Celexa 20mg/day and the occasional use of Ativan.
I think everyone experiences stress in different ways. Some of us just seem to handle it differently (more effectively than others).
Hang in there. Get some professional help. I'm sure your wedding will be beautiful.
If you want to chat, you know where to find me!
Best of luck to you,
Nicole