Know what? I think I know the answer now that you mention itOriginally posted by Dante B.
I'm ridiculously tired at the moment, so hopefully I'm not flying by something stupid (i.e. obvious).
Are you taking any new prescription drugs? Esp birth control products.
It's possible that you're losing muscle---but creating more definition (resting tension with heavier weight), perhaps taking in too many calories that you have less muscle to support.
Even with that, why your stomach is the first to be hit I don't know.
Are you absolutely certain that it's not water retention of any sort? For all of this to suddently happen, something isn't right.

I went off the pill in August and just started my first new pack soon after Vegas and finished it this weekend. Though I didn't get my period, this MUST be water retention?

