With jobs it's always a struggle. All I can say is to keep trying - keep going for those interviews, keep working at jobs etc. Maybe you could volunteer in the meantime, and after a while you could get a reference? Or speak to the jobcentre, see what they have?
In the mean time, you might want to figure out what exactly is stopping you from keeping jobs, and seeing if there is anything you can do to improve it. I know that might not mean much, but you're right - money does reduce a lot of stress, and so if there's anything you can do to improve your chances, then it's worth it
Wish you well, let us know how things go
Much love <3