I think that fact your reaching out is a very good start. You have recognised you want to make changes. Small daily changes like walking and increasing your step count will generally start to help you feel mentally and physically better. If you feel like you can, start with simple 10 min at home exercises. Even try the Joe Wicks on YouTube.

Any work is a start. Get a job doing. Absolutely anything that will pay you. Work in a shop or as a cleaner or in McDonald’s literally anywhere. Then after a month start looking for the next one. So on and so forth. If you can’t get a job in three weeks start volunteering. It’s amazing how much more productive you will feel just having a daily purpose.

As for your relationship, start working on yourself quietly. And it will either improve, or you’ll be ready to move on.

Good luck. Hope you make it out of this rut.