You have taken far too much on, and the more you give the more that will be expected of you.
If you have a breakdown who is there to look after you?
Those around you can barely fend for themselves so you would be just a burden.
Time for you to live your life for yourself. Back to Cornwall with its lovely surroundings and your circle of friends.
Those who rely on/sponge off you can always relocate.
Static caravan purchase is it worth buying