Hello. Thank you for your question and welcome to HCM. I carefully read your query.
It could easily be a simple
intercostal muscle twitching, that resembles like coming from the heart. It tends to happen after exercise and/or any physical activity that includes heavy breathing and/or after episodes of drinking alcohol. However, I would recommend you to do an EKG, and depending on that and your sensation, a 24-hour rhythm monitor, to exclude any possible bout of any kind of
arrhythmia. Also, your blood calcium levels should be measured. As for the other part, heart beats very hard in stressful situations, both psychological and physiological. My opinion is that this came as a very worrisome phenomenon to you, and the stress and
anxiety from it happening again, produced the other symptoms. Please, run the tests I recommended above and discuss the results further with a general practitioner.
I hope I was helpful. Take care.
Kind regards,
Dr. Meriton