Dear doctor, i am very sick. i dont know what is wrong, i am feeling bad in the stomach. i am having fatigue, nausea, dizziness and i keep belching and passing gas with mid headaches. I have been treated for malaria and typhoid fever sometime ago. but i dont know what its is now. anytime i stool, after stooling and i stand up, i feel very exhausted and dizzy. but there has been no rise in temperature recorded. pls what can it be?