I’m so sorry for your suffering i hear ya.
I have an answer which may seem a little left of field.
Capt Tom Bunn Fear of Flying
It is an amazing book from the library or purchase.
one of the examples in the book is a client of Capt Tom who used the same method he teaches to go under a huge long tunnel. i think 30 minutes long, with success.
Read the book slowly it is remarkable
At the end of the book and following the exercises i flew one hour to sydney and returned. The following weekend we went to Adelaide and two weeks later to Canada. Yes 14 hours away.
It really is solve able. You must read the book from the beginning . Tom is niw in his 90s an amazing man.
Apparently Australian Amanda Weeks wrote a book about 40 years ago with similar methods.
i wish you every good luck. i know you can do it.