Welcome to HealthcareMagic forum.
I see you've already suffer with a heart disease
, it would have been better if you had specified what kind of heart disease you suffer with.
In the back ground of both the clinical history, the episode is more likely to be a syncope/arrhythmia
. If there was any history of tongue bite
or urine incontinence
, a seizure also needs to be considered.
It was good that an ECG was documented during the event. Examining the ECG as a whole can give us clue if you've had a serious problem. In other terms, the machine interpretation of early repolarisation has no much significance as they are subjected to many biases.
I would instead suggest you to discuss with your doctor/submit the ECG to an online medical advising site such as yours for better interpretation of the ECG and whether or not those can explain the symptoms you had recently.
Hope this answers your query.