All that and at such a young age.
What is your family history on heart disease?
How is your weight, overweight?
How health healthy is your diet, much caffeine?
Is it predictable, regular, or can there be something you can isolate that goes on in your life (and style) before/during the high HR.
Emotional drivers and cause the problem, what causes the emotional outbreaks?
Sorry that reading your post raises question in my mind, not ideas or answers.