He has frequent involuntary head and shoulders movements, as well as an abnormal rate of blinking … clearly he’s either on something, or he’s trying to stop an addiction and consequently having withdrawal symptoms.
Without speculating on drugs use, as there is no proof of it, the guy owns/promotes two alcohol brands, is constantly photographed with a glass in hand, comes from a nation of “proud drinkers” … I would say that some level of alcoholism is more than likely unfortunately, and explains most of those symptoms as well as the out-of-control behavior and other McG incidents.