Do you ever post something where it's in your head, but you don't actually write it down? That's what I did. 
I was thinking of specific occasions when you are around alcohol but may not have been drinking to excess or even drinking at all. The time when I threw a full glass of wine all over the floor and innocent bystanders was my first drink in a few days at an office lunch. I heard later that someone said I was a functioning alcoholic who was so desperate for a drink that my hand shook uncontrollably in anticipation. He could tell - nice.
Another time I fell over like I'd been poleaxed - that sometimes happens which is why these days I wear flat shoes, potter like an old lady and always hold the handrail. Blood was pouring out of both nostrils and some people kindly put me in a taxi. The driver wouldn't accept any money when he dropped me off at A&E. For my part I bled into my scarf, not his seats 
I was so ashamed of what they must have thought of me I kept saying I hadn't been drinking - I'd just left work - but it was Christmas and the streets were full of drinkers, I so I don't blame them for not believing me. At least they were kind. The hospital staff also assumed I was drunk but quickly realised I wasn't. The thing is, when they thought I was drunk, they were still very professional and concentrated on checking whether I'd done myself any serious damage rather than giving me a lecture.
Pandamodium I'm sure those people believed you but that may be because you don't drink, so there has to be another explanation rather than the obvious one fuelled by all those lurid TV shows and newspaper features on Binge Drinking Britain.
Many people are kind and imaginative but if there's an easy conclusion lots of people jump to it. Even if it's nothing to do with alcohol, people are so keen to diagnose stuff because of something they once read about a celebrity with Parkinsons when it could be something far less serious.
What I'm trying to say is that when you put alcohol into the mix everyone thinks they are an expert and can comment on your personal situation regardless of their own. I've had people earnestly ask me whether I should drink in my 'condition'. I always thank them for their advice but say I'll rely on my doctors rather than a random person with no medical training whatsoever. Very rarely do they realise I am taking the piss.
Like gamerwidow and patq1967 say, you have to learn to ignore people.