Peripheral vascular disease is the medical name given to a group of problems that causes poor circulation to the legs and feet. Better control of his glucose and NOT living a
sedentary lifestyle helps, like
performing daily physical exercise. The alcohol consumption, "4-5 mixed drinks of whiskey", only compounds the problem.
One thought that comes to mind is Atherosclerosis, thickening of the arteries caused by diabetes mixed with alcohol consumption. Google it.