Thanks for posting your query.
You may have Cerebro-vascular accidents involving your cerebral cortex
Involvement of cerebral cortex may cause black out, weakness, and slurred speech.
Involvement of cerebellum may cause loss of balance.
You should consult with physician/ Neurologist
and go for CT scan of brain while better study can be done by MRI brain.
You should also go for 2 D echo study of heart and color Doppler study of carotid artery
as you have history of black out.
Get well soon,
Dr. Mayank Bhargava