If you're worried, than it's a good idea to get some testing. You don't have to worry about the endoscopy...lots of people have them after their Nissen surgery. I did.
Sorry you're still feeling badly. Hopefully, you can get some help.
Nissen Fundoplication 2/09
"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.”