BhIll, agree with Turtle. Exercise. At age 17, with 2 cardiologists telling you all good, you've got nothing to worry about
except your anxiety. What you are describing is classic panic attack symptoms. Exercise will help in the ways Turtle described, and also it will reduce stress.
You should probably consider psychotherapy, to get to the bottom of your real issue, causing panic attacks to occur.
Dx Age 64 Nov 2014, 4.3
BX 3 of 12 cores positive original pathologyG6, G6, G8 (3+5)
downgraded to 3+3=6 by Dr Epstein, JH
RALP with Dr Ash Tewari Jan 6, 2015
Post surgical pathology – G7 (3+4), ECE, Margins, LN, SV all negative
PSA @ 6 weeks 2/15, .<02, 4/15 <.02 7/15 <.02, 10/15 0.00 (new lab) , 1/16, 0.00
My Story: tinyurl.com/oo9x4aq