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Due to the alcohol
he could be a Transient ischemic attack
due to arterial spasm
in the brain. Alcohol can precipitate a TIA. He needs to get his blood pressure under control, also blood sugar in control, stop smoking and drinking alcohol, get an echocardiogram
to rule out heart and also rule out carotid artery disease
. He needs a fat free diet, eat plenty of fresh fruits and vegetables in diet. If his cholesterol and lipids are high in blood he may need drug treatment to reduce them, he needs to lose weight and stay fit if overweight. He will need to exercise as well.