Hi Speechie and Welcome - I have had my second Nissen 1-19-09 after my first failed that was only intact 3-4 months. I did have the feeling of fullness and my tummy was very gurgly. However, I barely had enough time for my recovery from my first before my redo.
My option is that you should go in and be checked or at least speak to your doctor about the problems your having. There could be a chance that it is slipped and that should not be something to put off dealing with.
Take care, Teala