As a psychologist who works with people with serious mental illness, serious drug and alcohol addiction, and criminal justice involvement -- believe me, things can get better. The first step is finding a professional that you click with, for therapy, support, and meds as needed. Those work. The second step is doing something -- ANYTHING -- that gets you moving and active outside the house (walks, exercise, fishing, shopping, picking up trash, volunteering, driving, whatever. Third step is curbing the drinking. Get AA or another support system in place to help with that. Fourth step is reaching out to friends and family, even if you think they will be annoyed or judgmental. You won't be asking them to carry all of your burdens, but instead to help support you in smaller and separate ways. Ask for specific things you need -- uber eats card, a daily or weekly text, watching a movie on Amazon party mode, playing games on the phone, an advocate to help you exercise, recipes, whatever. Put things in your calendar that you look forward to, and see if you can do them with others.
You can't deal in generalities. You have to get specific right now. Meals you want, movies you want, people you want, etc.
Those aren't in any strict order. You just need to do each of them, because you actually ARE important and the world and Surly is better with you in it. You are kicking ass RIGHT NOW because you are surviving shit that others aren't dealing with. It's gonna be fucking awesome when you come out on the other side, stronger and ready for anything else this world wants to throw at you.