Hello and thanks for writing in
In my opinion you must be investigated for that. You must go for Echocardiography
and holter examination and check whether you have long pause between two beats in it or not. If it present than you may need a pacemaker implantation
or some medication to improve the heart function.
The other region for fainting
are postural Hypo-tension, spondylosis
or some neurological deficit. Consult your doctor and get investigated for cause of fainting and hypo-tension and accordingly get the treatment.