Hi, I have been through the exact same thing, unfortunately for me my Dad passed away on the 15/04/2015 but I can share with you some of what I went through in the hopes I can help and the same doesn’t happen for your Dad.
Does your Dad know he has a problem and has he tried to seek help before? The hardest part to do is to get them to admit they have a problem and you should do everything in your power to get this out of them; if you feel sending this would help, send it. I also have my story on here, I posted it about a week ago, you could show him that.
You said above that your Dad is a strong character and this is where my Dad differed, he was very weak and gave in easily, he also suffered from anxiety and depression which made it hard for him to seek help. If your Dad is strong make sure you let him know that and let him know of all the things he has achieved and support him through the help if he allows it.
I tried everything to help my Dad, my Dad also got caught drink driving and was kept in a cell overnight; I wanted him to be detained for months, I know that sounds bad but I think it would have helped – they couldn’t do that though. I tried to get him sectioned but I got told he wasn’t a harm to himself or others, when he obviously was.
The only thing that is giving me peace of mind is that I tried everything in my power to help my Dad and I could not have done any more, neither could anyone else that helped him out. They can only help themselves too so just be strong and I hope you and your family see the light at the end of the tunnel soon.
xx