For a moment i felt lightheaded, dizziness, blurry vision, hot, i was covered in sweat, and then cold, i felt like i was going to faint. what can it?

Pre Syncope: Presyncope feeling dizzy and near fainting episode can be caused multiple reasons includes anemia , hypoglycemia , dehydration, arrhythmia, certain cardio vascular and neurological conditions. Simple test like hemoglobin and ekg , finget stick for blood glucose can yield valuable information. Although syncope work up includes holter monitoring eeg and a ct scan or mri. Consult your physician asap.