No matter what, one step at a time, get into the habit of regular food and sleep. This will make an immense difference.

Even if you think you can't eat, find something easy and get a few spoonfuls in. Praise yourself for this and an hour or two later, eat some more.

Eat better and you will be able to get some exercise, even a walk around the block. Eat, get some exercise, sleep will be easier.

You are going through so much and also moving, this is stressful. Good time to keep whatever you can simple and go through the motions of taking good care of yourself.

I speak from experience.