recently, I had an episode where I felt a sharp pain in my chest, followed by light-headedness, and then the entire left side of my body went numb from face to foot. i had to stop and sit down and it was pretty scary...the doctors seem to think it may have been cardiac related because of my family history, but I am extremely healthy and physically fit otherwise, and was wondering if it could have been more neurological , i.e. TIA.