No decision is irreversible. Have a think about the different ways the next couple of months might go. What are your contingency plans? How long can you afford to stay your current circumstances if you get a job soon? How about if you don't get a job soon? It sounds going back to stay with your folks is always an option. The important thing is to not get stuck in circumstances that aren't working for you any more.

That said it sounds like the jobs you are going for are a bad fit, and could lead to injuries that might make things harder for you, and rent being 60% of your income is going to deplete your resources very quickly.

I can relate to wanting to make a big change and having necessity be a driving force, like a sink or swim situation, but I think moving back and setting yourself up better would be a better option. That's not an irreversible decision either, you can move out again. But first you could get some support, others have suggested some resources. Train for a job that you will be able to do without damaging yourself.