While I didn't experience that, I've heard others who have described a similar situation. Have you contacted your surgeon's office? You should definitely not let it go with out a medical opinion. Hope it gets feeling better soon!
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.”