Welcome to the Healing Well Wrapped Club! Sorry to hear you're having so many swallowing issues. It sounds as if your wrap is too tight. If the dilations you've had aren't working, I think it's time to get a second opinion from a top Nissen surgeon, either in your area, a nearby city, or a center like Mayo or Cleveland Clinic. You've got a problem and your GI doc and surgeon haven't been able to fix it. Time for another opinion.
Did you have all the testing prior to your Nissen? In particular, did you have a manometry? Sometimes people have swallowing issues, and a 360 wrap will be too tight for their ability to swallow. In those cases surgeons usually perform a 270 or "partial wrap". It allows swallowing to be easier.
Your situation isn't acceptable, and there is a surgeon out there who can help you. The thing is, now that you're having a Nissen complication, you'll need to see a top, top, top surgeon who has done many surgeries and (hate to say it, but) redos.
Your handle has "ca" at the end, so I'm guessing you're from California. I'm not very familiar with the medical centers out there, but I'm sure there are plenty of top places to go.
Good luck with this. Wish you didn't have to deal with it!
Very best wishes,
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.”