Hard worker, delivery of heavy objects for past 30 years, 60 years old, smoker, high cholesterol, not taking prescribed medication. Today out of nowhere-middle of chest tightness, no pain, dizziness, light headed, couldn't get air, lasted about an hour. Slowly went away. If I kept moving and working it stayed. when I slowed down or stopped it slowed down. I had to lean against the wall to catch breath and deal with light headedness.