Fell off hard

I fell off hard!! Very hard and I can't understand why I can't get the motivation back, every week, I say "for real this week is the week", and then I crash and burn. Its a constant, constant battle, every single day I think about my weight - there is not one day that goes by that I'm not thinking about it. Something must be done, I saw some pictures of me today and I HATED the way I looked, hated it! Will that add fuel to my fire?? Not being able to wear my clothes or feeling fat, and tired and unmotivated have not fueled it - maybe those pictures were just the key. PLEASE HELP ME!!!!!!