I'm glad to hear everything went well for you. Just as a precaution, since this is a new feeling for you, you maybe should call your surgeon and explain this to them.
My guess is that it is post surgery swelling. I had a right side PT the first part of May. Every once in awhile I still get weird feelings in my neck. I just think it takes that area awhile to heal after all the poking and prodding that goes on during surgery.
Take care and rest often