When things seem to be totally out of control in my life, I have found that pre-planning my meals seems to bring some balance. Staying OP is the one thing that I can control, and it helps me feel better, which helps me deal with the other chaos better.
That being said, you are going through a rough time. Don't be so hard on yourself. Just recognizing that you could revert back to old habits is a NSV. Just remember, if you aren't being good to yourself (by staying OP and keeping yourself healthy), you will be of no good to others who may need your support. (You can't give away what you don't have).
I don't have a simple answer to your problem. If I did, I probably wouldn't be overweight and on this board. But know that we are here for you, and that we have all gone through rough patches.
Hugs