I am currently in the exact same situtation. I weighed myself for the first time after a month off track, i went up at least 7lbs. It wasn't good, but it was the kick i needed to get back on plan and to stay on plan. I suggest you do the same, it might strengthen your resolve.
Good luck with the study.
Yes that is a sonic screwdriver in my hand, if you ask nicely i will sonic you :P