So sorry you're having so many problems. Unfortunately, I don't have any ideas that might be helpful, but I would suggest that you find a surgeon who deals with redos on a regular basis. Redos are a lot different than original Nissens, and you'll want to find the best possible surgeon for the job.
Do you live near a large medical center? I suggest you do lots of research, interview a couple surgeons, and then decide what you want to do. If your original surgeon doesn't have a lot of redo experience, I recommend you look elsewhere for the fix.
Wish I could give you more help!
Words of wisdom by Eckhart Tolle:
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”