<p>A happy heart is good medicine<br><br>On October 8, 2015, Victoria Jackson was getting ready for a 45-minute stand-up routine. But instead of enjoying the pre-show excitement, she was laying on the couch in the green room coughing nonstop.<br><br>Victoria had many scary moments growing up: doing a back handspring on the four-inch balance beam; performing stand-up comedy; auditioning for Saturday Night Live; and getting held at gunpoint in down...