Don't cry, Sarah. We all have reverses, the whole human race. You'll figure it out, you really will.
Okay, here are two hints: try "magnesium oil" (rubbed onto your skin, the bigger the area the better -- wait a half hour and you can wash it back off, because it's sticky.) Helps with anxiety and sleep problems, good for lots of things.
Second, check out an Ayurvedic plant called ashwagandha. It's fun to Google and see what's out there. I tend to give more credence to the medical experiments done using it, but then I read some of the ("ommmmmmm") Indian sites just to see what they say. I find that the tincture works better than the capsules of powdered herb.
Anyway, I'm using it because it helps mend myelin, and I had a medical meltdown called Miller Fisher Syndrome last spring, so mending myelin is the name of the game. But one place I checked mentioned that ashwagandha lowers cortisol levels, and many called it "Indian ginseng" and "Queen of Ayurveda" but said that unlike Panax (Chinese ginseng) it gave a calm energy, not riled up and overheated, which I found consistent with lowering cortisol.
Good luck ... if you find something calm which you really like to do (for me it's gardening) that can help a lot.
And ... this too shall pass.