2 weeks ago I had a sudden incident of a racing heart. It was beating so fast that I nearly passed out. It lasted about 5 minutes and went back to normal. Since then I have had discomfort in my chest, swollen glands below my ears, aching jaw, and now my blood pressure is odd. 140/79 pulse 91. Is this something I should consider an emergency or should I change my lifestyle? I try to eat healthy, I have a very physical job, and I keep the stress in my life quite low