What Causes Pain In Navel Area In An Elderly Person?

My name is Mary Bradshaw. I am 65 years old and in good shape except for a pain near my belly button. I use to weigh 268 lbs (9 years ago) and now I weigh 150. I lost it because I changed my eating style, however I still overeat when I eat nuts, watermelon and some low fat deserts. I went to a Dr. in Montana and she was going to do an ultersound in that area to check for a hernia or possible an aorta aneurism. Then I moved to Arizona and my Dr. said don t worry about it unless the pain is so bad you can t tolerate it. Like I mentioned earlier, now when I overeat that area aches and my belly swells. I do not know what to do? Thank you.