I just regained 16 lbs (235-251) and am on my way back down (6lbs down, 10 to go)... it really sucks to have to lose lbs you've already lost but it's better than continuing to go up and up and up!
Sometimes you have to fake it til you make it. In other words, be committed even when you're not motivated. Do what you know you need to do even when you don't feel like it.
You can do it! Get back up and start again!