If you're determined, setbacks are only temporary.
I gained 5 pounds I lost this week, all from time off in the holidays. Pretty much as soon as I came back home I began seeing signs of losing that weight again since I returned to a regimen of lifting and cardio.
What helps me is completely internalizing fitness as a part of my person. Part of that process is watching videos that support those values. I lost count of how many times I've seen this one.
Here is the beginning of my project: http://www.cosplay.com/showpost.php?...&postcount=890
. I don't have any "after" pictures, but I want to hold off on that until I'm below 200 pounds.