Hi, I m 47 years old. I have not had a period since Jan. 27, and my stomach is swollen. For several hours yesterday, my lower abdomen seemed to be sort of undulating on its own, continuously. I did a home pregnancy test, and the results were negative. Because of my age, I would assume my periods are just ending, but until last month, I have been extremely regular. The sudden swelling/weight gain and weird movements of my stomach have me a bit concerned. Today, there is also a bit of burning sensation directly behind my navel. What could this be? Thanks very much, Sally