By the way, doctor.  When I attempt to go into the outdoor pool at my beach club, I gasp for breath, get dizzy and light-headed, and have to get out.  Several years ago, I read an article that some people who are very sensitive to cold water may sustain a heart attack from submersion into cold water.  Is this a possibility?
Lee
Thomas H
TH
D003080:Cold Temperature / Q000009:adverse effects*; D004244:Dizziness / Q000209:etiology; D006321:Heart / Q000503:physiopathology*; D006439:Hemodynamics; D006801:Humans; D009203:Myocardial Infarction / Q000209:etiology*; D005082:Physical Exertion; D013550:Swimming; D013551:Swimming Pools