I'm not a health professional, keep that in mind, but I've read a lot of my heart procedure reports so have an idea of what is reported.
The important words associated with Mitral valve prolapse are the words trivial, mild, moderate, and severe. Most young people would get a report of a trivial, or mild leakage, most of us old people have moderate leakages. Sinus rhythm suggests that there are no abnormalities, I have no idea about low limb lead voltage, and 'incomplete right bundle branch' reports just means that possibly the leads weren's well connected. I certainly talk to your doctor to interpret your heart test, but I would associate your symptoms as being a result of stress as a possibility.