I am new to all of this I was referred to the endo by the cardiologist as I am a frequent fainter....and out of the blood tests i have had for years the cardiologist tested my cortisol which was apparently low. The endo has booked me in for a syn test? I belive its called or something along those lines? I am very tiered but cannot sleep...feel drained daily.. . My memory is shocking and my fainting has got progressively worse..I have fainted 5 times since September and just don't know what to do :/ I guess I'm just looking for answers as not everything has been explained...I had a 24hr urine sample that came back ok also.