Welcome to the Healing Well Wrapped Club! I've never heard of anyone losing their gag reflux from a Nissen surgery. It'll be interesting to see if it's a long term issue, or returns with time. I would think your surgeon would be the best source on the topic. I'm sure the gag reflux has a good purpose, but honestly, without it all those tests (manometry, endoscopy, etc.) would be a lot easier to take!
Be sure and check out the Resources section of this forum:
GERD - Heartburn Resources It's got lots of great information!
Glad you've joined us! It's a great place for support and information during your recovery.
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.”