I'm so sorry you find yourself in this shit situation OP, it must be hard to keep a lid on panic 
As @DiscoStusMoonboots says
All it takes is one little glimmer of light, however small. Take each day at a time and take every opportunity and offer that comes your way. You will overcome this challenge.
I've picked myself up a few times. Met lovely DH#2 when I was in my 50s. Make considerably more £££ freelancing now (in my 60s) than I could have dreamed of in my 40s.
Try to focus clearly on where you want to live and what you enjoy doing. If you're in the right place, things will feel better on a day-to-day basis. If you had your own business, that means you're good at something. Have confidence in your abilities. You'd be surprised how rare it is to be really skilled and how much people are prepared to pay for someone who really knows what they're doing. Try to re-imagine a future where you don't undersell yourself. Who would be interested in what you do, and have the proper budget for it? Think think think 😊
Try to think in terms of "In 6 months' time, I'll review the situation and make another plan if necessary."
Be kind to yourself. Become your best friend and supporter. Every night when you go to bed, plan a little treat for yourself the next morning, even if it's just a breakfast you enjoy. Plan something for yourself later in the day, such as an online yoga/Pilates class. Take pride in the tiny incremental changes, minute by minute, hour by hour, day by day, that will add up to something really amazing over time.