Hi. Welcome To Healthcaremagic
Get the cbc and TSH, Blood sugar to look for anemia
and hypo/hyper thyroid
ism and diabetes
Get the EKG, Echo cardiogram to look for abnormal rhythms and anatomical.structural abnormalities in the heart.
If you older than 50 years, you ca get the Carotid Doppler to screen for the stroke.
If Everything negative , get the Tilt Table test
Regards, Dr. Jagdish