Have stomach pain, been feeling extra tired after i eat. is the extra tiredness a result of my body working harder to digest my food and cope w pain?

Infection?: Stomach pain and fatigue could indicate a viral infection, like a viral gastroenteritis. These symptoms can also be associated with nausea, vomiting, dehydration and diarrhea. Usually these symptoms only last a few days if related to an infection. However, if these symptoms are lasting longer, please see a physician for further evaluation.