My brother has fever from 1.5 days, on then first day, the temperature was cooling down and again raising up. But from last night it is constantly at 102�. Our home consultant asked for blood test, but only after 2 days. That is ok. But we are worried about the temperature. We used ice packs on forehead, but its not working that much. My brother has high headache. Is it any type of flue? Or any other disease. For info, he had dengue last year. Give me some advice.