At your stage of recovery I'd guess the shoulder pain is referred pain from an irritated nerve in the diaphram. I suspect it's still adjusting to the changes that were made when you had the surgery. I know how painful and irritating that shoulder pain can be. Are you walking at all? You might try picking up your walking routine and see if that helps at all.
Wish you weren't having to deal with that! It's the worst pain of the whole surgery in my opinion. I just don't know of anything to do for the pain other than walking, which was what worked for me.
I really hope it gets better for you 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.”