did the doctor tell you that you had GERD?
Try also sleeping with your upper body raised slightly.
No, just because you have GERD does'nt automatically mean you have MS. Millions of us have GERD and do not have MS.
Try to stay away from spicy and fried foods. Eat several hours before you go to bed. If the symptoms keep up and the Nexium is'nt helping then you need to get back in to see your Dr for more tests or possible med changes.