Any history of heart disease
in the family?
Any recent stress?
Was there any convulsion during the passing out phase?
Well its difficult to point out the actual cause unless you get the following investigations done:
1. Complete blood count
( to rule out anemia)
2. ECG : 12 lead ECG plus a rhythm strip ( to look into any rate or rhythm disturbance)
3. 2 D Echocardiography
: ( for proper cardiac evaluation as your initial ECG was also abnormal. It would also look into any regional wall motion abnormality and valvular function of the heart )
4. Chest X- Ray
5. C T Scan brain ( I suppose the right sided headache is a migraine headache
. In that case the CT scan report would be normal but still passing out episodes followed by headache requires evaluation especially when followed by slurring of speech)
So once these investigations are done we can specify the cause.
Even the chest pain might be because of panic attack
. Did you hurt yourself in the chest when had fainting episodes?
Also I presume you dont have any history of asthma.