Disappointments

I am so very disappointed with myself. I have completely fallen off my "healthy eating" track. AND my exercising track...that one didn't last long at all. It is so frustrating because I keep thinking if I had just kept going how much weight I could have lost by now. I always seem to have motivation at the WORST times...like 9pm, or the middle of the work day, or in the middle of tornado warnings. By the time I have the opportunity to exercise, the motivation is long gone and I've already settled down with the cookies. Why is that? Any advice?