That sounds like esophageal spasms. I didn't have them, but some people do. I suggest you call your surgeon and report them. He/she may have something to suggest that can help. Let me know what you find out and how it all turns out.
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.”