I understand your suffering, in recent years I have tried your same things, in November they had diagnosed a bad disease to my father, and my mother also had problems. Fortunately, the tests that lasted several months have averted more serious things and now I'm breathing a little bit. It is not easy to face certain situations especially when you live far from your parents. Everything becomes difficult and complicated. Excuse the rambling but having experienced a similar situation recently I feel very close even if the pathologies are different. I wish you the best!
A big hug!