Sounds like you're good to go, as far as I can tell, though I'm no expert.
Personally I'm an endo so I would have to drop my carbs if I wasn't as mobile as usual.
I think the Perc may increase water retention IIRC...in that case I'd try to cope without it, or take as little as possible. Keep your Na/K balance in check. Then again I am not 100% sure about the possible sides from that drug.
Good luck man, you are in a tough spot! Horrible timing too, you have beach season coming right up!