23 years male, 177cm, 66kg. for the last 3 months i have been having chest discomfort, dizzy, palpitations and fast heart rates (90-110 at rest), high blood pressure (24h monitor revealed 133/75mmHg, pulse pressure 58mm Hg, heart rate 86bpm - during sleep 126/63mmHg and heart rate 64bpm, it fluctuates between 50-84bpm), sometimes i have bluish/purpule lips and nails, sometimes i feel like my throat is closing or narrow. ekg was normal, echocardiogram did not reveal anything, and bike-stress test was ok (time 0= 145/85mmHg and 132bpm, reached 171bpm @ 175w in 8:17minutes - after 1st minute it went down to 150bpm, the second minute it went back up to 157, the 3rd minute 143, 4th 134, 5th 133bpm; my bp went up to 175/95mmHg, 3rd minute of rest it went back down to initial 150/85mmHg). i did not fell any pain or problems breathing, just a little lightheaded. i still get palpitations (at rest), my lips turn bluish at the corners, i feel slightlly faint or dizzy. i can run for 15 minutes(5 walk, 5 run, 5 really really fast run) and not have any discomfort (maybe a little dizzy or lightheaded). what can it be ? if i experience chest pain or discomfort, wouldn t exercising while i feel it make it worse ? i tried it twice and the discomfort went away. (still get that blue color on the side of my lips and purpule-ish nails). my dad had a heart attack when he was 45.