Horrible health anxiety

How do you cope with huge health anxiety? I feel like it's diminishing quality of my life. I keep google-ing my symptoms, finding the worst possible diseases that match and than I sink into deep fears. It's not just well known things like cancer, although, there is that too, of course.
I have horrible fear of als, mostly I guess, because I am very independent, live alone and I really don't have anyone to take care of me if I require help and care for months or years, especially that kind of care when you can't even move. I am also very dynamic person, I can't sit still for few minutes and have RLS because I am anemic so sitting still or lying down is even harder for me. All that makes me fear of this disease which no one still knows what the cause is or how to treat it or even how to slow down symptoms. It's terrifying! I think I developed kind of obsession with this disease.
To make matters worse, I am very prone to fasciculations, one of early symptoms, I have them everywhere for years, even decade. Recently, I have some even on my tongue, and of course I am online googling as crazy and asking all the doctors online and irl about it. I can't stop this obsession.
on the better side, I am not obsessed 100% of time, there are days, even weeks when I am fine. But then some weird symptom appears, or I get those twitches somewhere (today, again on tongue) and I start to obsess. I am perfectly aware I am wasting my life on this, but I can't stop, even though I've been to number of doctors, therapists and neurologists and what not.
How do you deal with such destructive thoughts?

Health anxiety is something I struggle with you. So my heart goes out to you.

I have been helped by psychiatric medication and cognitive behavior therapy although to be truthful, I was helped more by reading the books of famous cognitive therapists on the problem of health anxiety than I was by face-to-face therapy.

I think the book that helped me the most is something called "The Worry Cure" or "The Worry Remedy" or something. Sadly I loaned it to a friend and I don't remember the author's name. I think his last name started with the letter "L" but am not sure. [Not trying to promote that book or anything since it is quite old and there could be many more books that are better or more helpful.]

I sure hope you find something that helps you because health anxiety is just awful. It robs one of peace of mind and really wrecks joy of living. Sorry I could not be more helpful. Hopefully others here will have more helpful words than my poor words.

I can definitely identify with you!