Q I have diarrhea,headaches,nausea,upset stomach,and pain. since 4 days
The symptoms you are suffering from are indicating an gastrointestinal infection by the microorganisma like bacteria or parasites. You must take the light diet and take more water to control the dehadration cuased due to diarrhoea. It may be due to certain other pathologies like appendicitis, crohns disease, intussuseption etc. It is necessary to rule out the cause and treat the diarrhoea at the early stage because dehydration may lead to life threatning complications.