Hi Bob. The term ‘stomach bug’ is quite broad and these microbes can have different effects. For example if you have gastroenteritis (usually viral but sometimes bacterial) then you will experience symptoms like nausea, vomiting, diarrhea and so on. These infections usually last for 2 to 3 days and then resolve. Bacterial gastroenteritis may require antibiotics. However, some of these bugs can cause symptoms for many days, even weeks and longer. On the other hand, a ‘bug’ like H.pylori which causes gastritis or peptic ulcers causes symptoms like indigestion and stomach pain. This type of infection can be chronic if not properly treated. It is best that you discuss your symptoms with your family doctor.