Drifted Off Track

First, I want to start off by saying that I feel like straight crap, I have drifted so far off my weight loss mission its unreal. However, I am determined to get back on because I need to lose at least 15-20 pounds before July 15 and that's my minimum. The problem is though I don't know how the hell to get back on my mission, I have absolutely no drive since I started my spring semester at school to deal with anything weight loss related. I'm sure that I have put back on some of the weight that I have previously lost, how much, I can't say because my mother hid the scale from me and my Wii board is in need of batteries...so I have no idea how much a presently way and frankly I'm a bit nervous to find out.