If you can't work, then you can't work,
You get benefits to keep you alive and functioning, that's how our society works. It can't be a great life though, and that makes me sad for you as you sound down.
A wee fire in your belly is exciting! We all need something that gets the blood really pumping, for a lot of people work does that. Yep, it's work so can be a drag but there's nothing better, for me, than the satisfaction of coming home at the end of the working week, knackered but knowing that I did a good job.
If I couldn't work I'd need to get that satisfaction from elsewhere, have you thought about study at college in something that interests you? That can stoke that fire?
Exercise? Charity walks etc those type of events need loads of volunteer stewards etc or take part yourself.
Befrienders, especially for those elderly who really really benefit from people to visit and have a conversation with.
Basically have a bit of structure to your life.
I go all to pot when I don't have any in my life, for example I always since 16 yrs had a full time job, age 36 got pregnant and then went on maternity leave, thought I would love it - whole year off with baby. Hated it! Couldn't cope with the randomness of baby schedule and wondering how we would fill our day. Was much happier when I went back to work. Baby is now a teenager. For the last few years I've been part time at work, thought it would be great being part time. Turns out not, I've been struggling with what to do on my days off and feeling guilty for them not being fulfilling and I'm starting a new full time job next week, and I've fire in my belly again!
You need to find what works for you, and as I said earlier that doesn't necessarily mean paid work but a Purpose at lest. I hope you find it.