HuntingBears, didn't you also just ask a question about alternate day fasting?
I'm worried about you, dear. I know you're basically at the end of your rope in trying to improve the appearance of your skin and also help lift your very, very low moods. I think you should just choose a plan and give it a try. Seems like you're suffering that ol' paralysis by analysis...becoming exposed to too many different ideas, searching for the one that will be your magic bullet. Honestly, you've gotta just get in there and TRY something. And give it enough time to see if it's actually working. Very stubborn problems do not go away overnight, even when a dietary or lifestyle change is working.
Ultimately, I think you might do better to just relax a little. Eat real food. Avoid trigger foods if you have any, and keep it as clean as you can manage. This quest for some sweet spot of IF, eating windows, and calorie roller coasters is, I think, doing more harm than good.
I do believe there is a sweet spot for most people, but don't obsess over finding it right now. Just do your best with eating well and loving yourself. Loving YOU, as a human being, who just happens to have skin she's unhappy with. I have upper arm batwings no matter how much triceps work I do. And a little gut roll even though I'm overall darn happy with the weight loss I've maintained over the past few years. I'm not perfect but those flaws do not define my worth as a human being.
I think you could really benefit from this beautiful, beautiful post:
Stacy's AWESOME post
and this one:
The Fattest People in Paleo
I know you're not trying to lose weight, but these address the other, deeper issues surrounding all this stuff and I think you'll find something that speaks to you.