a doctor feeling around isnt going to do anything. While 6 days is a lot is can be a stomach bug. They can last 10 days. If it goes more than that you should consult a GI specialist.
In the mean time, try eating foods that are very bland and binding like plain rice and bananas.
You want to avoid any stomach irritants like dairy, gluten, coffee, tea, fast food, greasy foods, etc.
Steam up some veggies and chicken, you can add some chicken broth if youd like. have that with rice. Hopefully that will help.
Diarrhea is also very dehydrating so you have to keep drinking water. I'd also suggest coconut water as that will help replenish all the electrolytes you are losing.
It sounds like you have/might have stomach flu.