It will be interesting to hear what your surgeon says. I don't see how a PPI can mask pain. It would seem to me that if a PPI helps the pain go away it's because of its effect on acid pumps and its ability to protect your healing wrap from an onslaught of that acid. I'm thinking like your PCP, I guess.
Many of us continue to take PPIs after surgery while we're healing. Often surgeons request that their post-Nissen patients do just that.
My surgeon did put me on solids ("anything that can be chewed to a liquid") on Day 6. I still couldn't eat much at all, because my stomach swelling was interpreted as fullness and I could only eat a tiny amount without being stuffed. If you take tiny bites and chew, chew, chew, you should be just fine. If something doesn't chew to a creamy/liquid consistency, deposit it in a nearby paper napkin. Stay away from untoasted bread and steak, though.
Good luck with your appointment. Let us know what you find out.
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.”