It was interesting to read your message, because as you were listing the changes in your husband it sounded exactly like mine! Mine used to love boats, spent all of his time working on ours, cleaning, fixing it up and taking the boat out whenever he had a chance in the evenings and on weekends. Now he wants to sell the boat and 'never wants to see it again'. Mine too was a neat freak and then became a slob. My loved our business which we established together, and then changed to seem to hate every moment he was in the office. Mine too changed from a social drinker to getting drunk every night. This all sounds like typical MLC.
I am now about 1.5 to 2 years into my husbands MLC. He has changed for the better. I found this website and read the DB book starting last April. Although my husband still has periods where he seems to run away and also acts like a teenager - he has changed for the better. I know it is hard when times are dark and you can't imagine what kind of alien is in your husbands body, but try to have faith in the man your husband was, and can perhaps be again. Slowly with DB-ing my husband started to help clean again, picked up after himself, and started to care again about our house and business. Is our divorce busted? I don't think I have a final answer on that yet, but he has not mentioned it for many months and it gives me hope.
I hope it helps you to know that you are not alone. Read as much as you can, there is very good info in the MLC archives. I also find it helps to keep a journal, I try to look for good things every day and that helps me to not feel so overwhelmed.
Me - 38 Husband - 40 MLC! Together 12 years Married 11 years Still the love of my life Forever only lasted 10 years before his MLC and affair