Feel free to ignore this, free advice often being worth the price.

You’ve pretty much described the dictionary definition of depression. The meds work, if you can find the right ones. A lot of people are reluctant to go that route, but really, c’mon, here’s one problem in life that you can actually take a pill for–please consider it. I’m not a doctor, counselor, blah blah blah. But seriously, sometimes you need a crutch to get back on your feet, and sometimes it turns out you need it for your whole life. Pills are a pretty minor inconvenience in the grand scheme of things–find a professional, talk to them, see if they think a prescription would help. Also, major changes of scene can do wonders, if you have the means.

Also, metaphorically speaking, it’s a good idea to get your house in a reasonably orderly state if you want people to start staying there with you. Honesty is good, but there’s still such thing as timing. Don’t rush things unnecessarily.