Let me start off by saying that you have a remarkable attitude and wisdom for your age. You are a lovely lady and your dad should be proud of who you are and what you do, and especially for how much you care about him.
I have to say that you are right - your dad needs counselling. However, when you develop habits over years, those habits become your reality. His habits have become his reality and if you ask him to go for counselling, he will make out a very good case why he does not need it.
The solution is for you to find a counsellor that you can trust, and that you think your dad will get on with. And here is where you have to become a bit of an actress - you will have to convince your dad that you are not coping emotionally, and that is why you want to go for counselling.
You need to make him understand that you are the ‘victim’ and that he needs to help you get back on track again. I would not normally encourage people to bend the truth, but you are mature enough to do this, and it will convince him that he needs to see the counsellor so that he can help you. That will be the first step towards you helping him without him even realizing it.
You may want to discuss this with your GP or a church minister and get advice on where to search for the best counsellor.
Good luck and blessings to you.