Is he an alcoholic? Is she being naive?

[tiaandduck]

My sisters husband has been suffering from anxiety for over a year. He's been on sick leave all this time. He clearly suffers from depression as well and has stopped seeing his teen children. I don't know the ins and outs of that.
Every time I have visited he has been drinking, even during the day. I think he's been drink driving also but can't be sure.

It has all came to a head. They went on holiday and he couldn't function. Shaking, slurred speech, odd walk. Wouldn't participate in the holiday unless a drink was involved.
He fell twice and cut his head open, once on a road and almost hit by a car. He blamed it on the medication but he was clearly drunk.
My sister says he just needs to get the anxiety meds right and he's stopped taking them because they make him ill. She says he deals with the anxiety better when he's had a drink. She's making excuses for him. He doesn't seem to acknowledge how bad things are, says he will cut down the drink. He has spent all day vomiting, not sure why.
He has been back from holiday one day and hasn't been to the dr yet. Hos behaviour on holiday was shocking, everyone staring, falling into sun beds, needing his hand held going to the toilet etc.
I'm so worried but she seems to be making excuses for him, blaming it all on the anxiety but I think it's becoming clear he's an alcoholic?

Self medicating to 'cope' with anxiety can definitely trigger a decline into alcoholism. Alcoholism itself is a mental illness so it's often hand in hand with something else.

She's massively in denial as well as him judging by your post. Until one of the acknowledges the situation there's not much anyone can do for them.

If / when they do then I'd recommend AA for him and Al Anon for her

@FusionChefGeoff Thankyou. Yes I forwarded a link to Al anon but she said she thinks the anxiety is more of the problem and the alcohol just helps.
He stopped taking the medication on holiday and favoured the drinking.
I think if what she said was true then falling over a sun bed and cutting your head and giving yourself two black eyes, and embarrassing your wife and stepchild would be enough to not do it again to the point you can't walk and stumble on to a road and cut your head open again!
Plus the day drinking at home. I think he's lying to her and hiding how much he drinks, especially when she's at work.