My Son Is A Healthy, Athletic 17 Year Old. He

My son is a healthy, athletic 17 year old. He passed out for what seems to be no reason about 40 minutes ago. He has had labored breathing, confusion, tunnel vision, dizziness, fatigue and reports feelings that something isn't right since then. I have given him water and juice in hopes to help in some way. His heart rate is around 60bpm and he had a temp of 99.