3248 - Your concerns regarding heart problems are unfounded.

I recommend examining the condition of your tefillin, mezuzot, and tallit katan, while putting your trust in Hashem. I encourage you to study Chapter 41 of Tanya orally, study Chitas, and actively participate in Chabad's activities and farbrengens. https://www.torahrecordings.com/rebbe/igroskodesh/010/005/3248