Welcome to health care magic. with the available described syptoms, there appeares to be possibility of viral gastroenterititis. as u felt hot because of fever in which temperature above normal due to increase in body temperature in set point. When temperature returns to normal a persons feel hot , become flushy and may begin to sweat. dont worry it will settle when other symptom decrease. cause of gastro is outside eating, infected water driking, unhyigenic condition,. in this more important part is maintain hydration by driking more water . treatment is _any antacid like omeprazol, pantoprazole., to control nausea, _probiotic useful to get intestine flora normal _ avoid spicy food ,outside food,, _take time to time meal specialy healthy diet . hope I answered ur query , any further query ask freely.