My Dad is in trouble with his health?

Hot flushing on the back may either be his kidneys or if it is to the side, possibly a liver problem. Since he is an alcoholic, his organs are working overtime to counteract the poison he is putting into his system. He also most likely has hypertension, narrowing of his arteries, he loses billions of brain cells each time he drinks. He should go to a primary care physician, get a thorough examination, and undergo steps to stop drinking. If not, he will most certainly face more than just being flushed, hot, and slight pain.