What Causes Dizziness And Elevated Blood Pressure Level?

Neighbor s son just lays in bed. Always was able to work in automotive body and fender repair. Recently painting cars. Now feels very light headed periodically with rise in blood pressure, with cheek reddening. Not a spinning sensation, but feels like he will pass out. Recently tested positive for auto immune problem. Mother diagnosed with autonomic dysfunction. (She keeps house cold all year round, or else cheeks very red and BP goes up). Son went to ENT today, waited an hour, but had to leave as he felt like he was going to pass out. Has seen many doctors