Hi Alice,
My heart goes out to you with all that's you've described.
I'm always very wary about giving life-changing advice to people whos own situation you done really know, but in your case, if you did the old, tried and tested test of writing pros and cons on each side of a piece of paper - I think youd have a pretty one sided piece of paper.
Some things can be fixed after a while - others, the longer they are left broken, the more it is to fix them, if attall. I think some of the aspects you describe need that immediate attention back in the UK.
I'm been back in the UK now on a trial return for 2 months so can appreciate how much personal life type things are easier here than on the other side of the world. My own on-going story is for another day.
All the very, very best my dear.