Jewlz, just don't punish yourself this week! You'll be in withdrawl, so your body is going to be acting a little out of whack, anyway. You sound like you're on top of everything, but even if you do gain a little weight from quitting, it's only temporary, and you'll drop it in no time because you'll be able to breathe better when you're back to your hiking around!
(I did gain, but less than 5 pounds, I think?)
Good luck!