Have you tried some intensive exercise when you get in that place? Depending how deep your depression/anxiety issues are, I don't know if this is possible for you...definitely people in the middle of severe depressive episodes have trouble getting moving, and thats a larger issue. But, for me (diagnosed PTSD, anxiety disorder, and recurrent depressive episodes which cause insomnia and, previously, overeating, for what its worth), nothing will calm my anxieties and relieve my depression symptoms better than exercise.
So for me, depression/anxiety actually HELPED my efforts, in a strange way, because it gave me an additional motivation to exercise. I knew that if I stopped the exercise, I wouldn't be managing my symptoms as well, and it was a MARKED difference with even a day or two of skipping the gym, so I kept my motivation a lot easier.
That being said, on days when I'm having problems with my anxiety or experiencing insomnia due to a depressive episode and the exercise hasn't calmed it down, it can be horrible to get out of the house and get moving/eating healthfully.

and lots of support to you.