Oh boy. You have really been through some rough times, I am so sorry about that. Especially with not having family around for support.
So what you're describing with texts sounds exactly like what I would experience with anything related to hospitals. My wife has experienced many severe health problems, and even TV shows about the medical world would send me into a tailspin. I would have physical reactions—heart racing, intense fear, etc.
I talked to my doctor about it and he diagnosed me with panic disorder or PTSD from the experiences I had. I was put on medication that helped a ton with panic. I also continued seeing my therapist.
I am not a doctor, but maybe you're experiencing something similar? I know you don't want to be on meds, but maybe it's worth talking to a doc and see what they say?
At any rate wish you the best, these scary feelings are not fun.