My 60 year old dad has been a heavy beer drinker most of his life. For more than 36 years he has had episodes when drinking. Sometimes this happens after 2 beers sometimes after 12 beers. His body stiffens up, doesn't seem to affect from waste down as he can walk, sit, stand, but his hands stiffen and he can't move his mouth when he talks and his arms and hands severely tremor. This can last anywhere from a minute to 30 minutes or more. Then it just quits and he is fine again and then it will continue to happen every so often throughout an evening. He has been diagnosed with essential tremors he has when he is not drinking but was told these episodes are not related. Has had a brain MRI and nothing was found.