Upset stomach and headache for 3 days

Nausea, loose stools or reduced appetite can lead to dehydration, which may intensify a headache. A viral illness may cause digestive symptoms with fever, aches or tiredness; respiratory infections can sometimes bring nausea as well. Heat Exhaustion is another possibility after heavy sweating or time in a hot setting. Headache can also accompany nasal inflammation, anxiety or medication effects. The combination does not identify one condition.

Take frequent small sips of water or an oral rehydration drink, and choose light foods when appetite returns. Rest somewhere cool and avoid strenuous activity or alcohol. Note urine frequency, fever, vomiting, stool changes, recent travel, new medicines and possible mosquito exposure. Use only medicines you normally tolerate and follow their label; ask a pharmacist if vomiting or dehydration makes a choice uncertain.

Arrange a review if symptoms have lasted three days without clear improvement, you cannot maintain fluids, or you have ongoing fever, repeated vomiting or worsening diarrhoea. Seek urgent help for a sudden severe headache, stiff neck, confusion, fainting, severe abdominal pain, blood in vomit or stool, breathing difficulty, or very little urine. In a dengue-risk setting, fever with severe headache, marked body pain or bleeding needs prompt assessment.

Could dehydration, infection, heat or a medicine explain this combination? Do I need an examination or tests? Which fluids and pain relief are appropriate while my stomach is unsettled?