It's sure that ephedrine helps losing weight but there is no clear evidence for the "numerous deaths" especially since many countries have not banned its consumption, and it does not appear that this specifically poses problems. What is certain is that it must be consumed in small quantities.
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It sounds like you went through quite a journey with the EC stack. Sorry to hear about the jitteriness and discomfort, that doesn't sound pleasant at all. And discovering a new heart murmur must have been concerning. It's definitely important to be cautious with any supplements, especially ones that affect your heart health. Building muscle is a great suggestion though! Not only does it help with weight loss, but it also boosts metabolism in the long run. Thanks for the advice!