welcome to HCM.
What you experience as right chest beating fast may be nothing but muscle twitching on that side. This could be due to low blood calcium level. Try taking calcium tablets, one daily for a month or so and see if goes away, otherwise consult a physician and get yourself examined, including ruling out a rare condition in which the heart may be on right side (dextrocardia
) instead of it's normal position on the left side of chest..
Wish you all the best.