[sachingoyal]

Hope you feel better .

I am underweight so I am always rejected for blood donation stuff, but I have never fainted otherwise for regular tests etc..

I have once fainted (briefly) on an international flight. Same .. BP went down. That was due to lack of sleep for many days in a row, and triggered natural body phenomena to force me to sleep/faint. Pilots were thinking to do emergency landing, but thankfully there was a doctor-passenger on the flight who said nothing was serious and flight can go on. It was quite embarrassing for me as the doctor made me lie down near the emergency exit seats on the floor for 20-30 minutes.