Hi, Butterflylover;
I'm not OCD, so, I don't have those same problems. But, I've suffered depression. And I know that I have to be vigilant about taking care of myself physically, mentally, emotionally and spiritually in order to be at my best. It's a tall order for sure, especially if I've lapsed. But, you can start by picking one, and building up by adding one more at a time.
I honestly think that the physical piece is the most important; eating nutritonal foods, laying off the junk, and getting enough exercise and sleep. You'll find immediate benefits right away with just that. Thereafter, add on the others in which ever order you find most appealing. That way you'll be most likely to stick to it.
I'm sure others will come by to share their own ESH. I hope this helps.
Shalom!