Ouch, you are having a very hard time and I am sorry to read that. RE your question about your throat being burned I suspect an ENT or PCP could visualize your throat and be able to tell you if it appears burned.
Links with tons of info for you:
Denise's Nissen Recovery Journal
My Forum Journal
Bill's Nissen Recovery Journal
Hope these links answer lots of your questions.
and Heart/Cardiovascular Disease. "She Stood in the Storm & When the Wind Did Not Blow Her Away, She Adjusted Her Sails."