Oh dear. I can relate. My mother-in-law is 100 and is remarkable for her age, but she doesn't push herself too much. She arguably doesn't push herself enough!
However, I relate to lurching from one crisis to another. My husband is in the wars at the moment, and I have leg issues. We are doing our best to manage things and to get scans or consultations where necessary, and fortunately, my knee issue is improving, but sometimes these things can take months or years to sort out.