gangadharan is right, some symptoms of a heart attack
as so mild you don't even know you are having one. Mine started in my back as back pain
but soon moved to my chest. Get your Dad to the hospital, it is still not too late to see if he had a heart attack. They can still tell up to 72 hours with a blood test
. I doubt it was because he was drunk. Take him to the ER. Better safe than sorry.