Sudden heat sensation like blood flowing feel left leg arm and left side of the head when relaxed bp 130/85 pulse 73 can a pinched neck nerve cause this or maybe blood sugar happened twice in 3 days ?

Pinched nerve: Not a pinched nerve. The sensation of heat flowing through the left side of the body is not typical of a pinched nerve in the neck and certainly not a pinched nerve in the back. I would go see your medical doctor for an examination and further testing to determine the cause of the left sided flushing episodes.

No not nerve yes cou: Pinched nerve usually causes pain over a certain area not a sudden sensation in large area of body a low or sudden drop in sugar say if taking diabetic meds and have a reaction you could have this warm sensation