Perhaps Elizabeth you have been the one that reacts and supports these others the most, and then,sadly,all too often these people soon realise which "port" they can turn too when another storm arises.
You may have made yourself far too available and need to accept only so much, and then happily get on with living your own life.
I have always been that one all family and friends turn to to off load and so I fully understand.
Yes you have strong shoulders and a big heart perhaps.........but when everyone comes a calling,needful and searching for answers and yet more support, you will find it draining of your own resources.
I know I did..........but could not stop .......feeling I would let down too many people.
I think, in your instance you now need to make some boundaries and clear guidelines as to how far your own resources can stretch out to help these unwell and needy folk.
Look around.I feel sure the others equally able and qualified to offer various modes of help.
Do not allow all this to build up within you because...............please believe me, as one whom knows...........you will end up empty,quite void inside after all has been systematically drained over time.
Get this sorted for your own good.
Good Luck.