It is possible for stomach cancer to develop that quickly, although it is certainly uncommon. I agree that the chances are less likely.
However, to be sure, if you are still having symptoms, a repeat upper endoscopy can be considered to evaluate for this possibility.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_