Thank you for the information.
Some people sometimes feel their heart beating on lying on one side , specially in
high output states.
From your history it appears that you are feeling it while even in standing or sitting position for a brief period & you have to stay weird till it passes off.
You may have episode of tachy arrythmia (rapid &/or irregular heart rate & rhythm)
You should contact a Cardiologist to have an examination & ECG.
He may adise for event monitor where a device will be attached with your body to record the ECG & you will be able to record the episode
This will help to find what actually happened during the episode.
If you need further clarifications, I will be happy to explain further.
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