When did you have each Nissen? What tests did you have to document the fact that each Nissen had failed?
With the problems that you're having, it sounds as if you'd benefit from visiting a great medical center for another opinion. Do you live in an area where you could reach one? Cleveland Clinic is highly thought of, I'm sure big hospitals in NYC would be very knowledgeable about handling difficult cases. The Mayo Clinics are another option. It depends on your location.
Here is a link to the best GI hospitals in the country:
Glad you've joined us! I'm sure others will be by to provide support and information.
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.”