cant diagnose cardinary artery diseases without data especially a blood test. High risk factors of heart attack
are 50+, family history, very high BP and HR, high cholesterols and over weight. Many causes of same chest pains: acid reflux
mostly, gallstones, thyroid, cracked ribs, lung, nerves; etc. Dizziness plus double vision
or misjudgement of distance or speech in high BP people is mostly a ischemic stroke
or side effect of alcohol or chemicals. Good luck to your friend.