Anyone ever heard of this phenomenon?

It's a little thing called "Dress Anxiety" and I think I have discovered this new and terrifying term this week in a not so fun way.  I had my dress fitting Sunday, supposedly my final fitting, but the dress wasn't ready.  No biggie except when I put it on, the thing fit different than I remembered.  Is this all in my head, or has my trainer/torturer Nicole changed something in my body shape.  My slightly curvy (I like to say voluptuous) figure that seemed to look great in the dress when I bought it, seems to not fill it out quite the same anymore...
Do I screw the training and eat oreos and pizza until the wedding?  Nicole and I think not.  Do I get the dress adjusted some for my hopefully even slimmer profile by the wedding?  Or is this all a big subconscious ploy of my glutton for punishment brain to make me second guess my dress??  I've seen this on "say yes to the dress" and it never works out the same; one girl got a new dress and one just tweaked hers a little.  Oh what I wouldn't give for Randy to pick out my dress...
I love my dress, right?  I tried on others and kept going back to this one, right?  Surely I can adjust this dress to fit the way I want, right?!?  I can't stop thinking about this and I'm not sure what to do.  I'm thinking I need to go to the store and try on my dress again to see what the hell I'm talking about~ they have to let me even though its in alterations, right?
And why do I feel like every post is a "freak out" post and not an actual update?  I hope this doesn't become a pattern...