I had those symptoms a few months ago. Went the whole route at the Mayo Clinic. Could not find anything. Was so dissapointed. Then they come up with Functional Dyspepsia. Most Dr.s do not even know of this. It is a real condition but scientists do know why. I have studied papers all around the World and they all said the same thing. You have to look it up. Anyway a Dr on this site suggested to some one else to try FDgard. It is a medication pill form you can get at Walgreens, cvs Pharmacy or Amozon. I buy them at Amozon they are cheaper and can cost up to 30.00 a week. The thing is they work. They are a bit of peppermint and oils. Totally natural,no side effects at all. Look all of these suggestions up. From miserable to happy again. Good luck by the way I am a active 70 also!