My heart goes out to you! It's a terrible situation to be in without depression. Depression just makes it so much worse.

I don't have any great advice, unfortunately. I'm sure you've told your prospective employers that you would be happy to take any job, even if you're "overqualified." Is there any kind of freelance work you could do? Accounting, tutoring, writing, personal assistant ...? What about sales on eBay? I have a friend who did that; he bought jewelry from a wholesaler and all he had to do was take the photos of the products and write the ads. He didn't even have to store the stuff or ship it out. I can't remember what it's called, but I think there are ads on eBay for this, or maybe you could google it.

I am in a VERY similar situation to you, so I can understand a little bit of the fear and discouragement you feel. Sending lots of hopeful thoughts that your situation will turn around soon.