My uncle carried on driving lorries for many years following his diagnosis, with the full knowledge of his employers. Then he had a near miss whilst at work - was pulled up by the police because they thought he was drunk. A rookie copper who'd just done a first aid course smelt his breath and checked out his dog tag before getting him an ambulance. Otherwise he'd have probably died in a police cell somewhere. After that, he lost his licence on medical grounds but his bosses were able to redeploy him, fortunately.
As for alcopops, alcohol can play havoc with blood sugar levels even in a healthy person. My uncle used to drink a lot before his diagnosis and for some years after and has done himself no favours. Even now he occasionally overdoes it at parties, much to his teenage granddaughter's disgust, and pays the price over the next day or so.