My husband was told he has ADD/ADHD but he refuses to take medication for his fear to become addicted... now he wants to divorce

I am 29 years old and I have been married to my ADD/ADHD husband (31 years old) for 7 years now, we have 1 kid together (6) and I have a daughter (10), those kids love him to death, I am in love with him in spite of the fact that he has left us 5 times, the last one lasted one year of separation, now he wants to leave us again, we are crushed... we went to a marriage counselor last year and he told my husband he has the symptoms and he went to his primary doctor and he prescribed him with Strattera, when my husband got home, he said we couldn't afford it and that he was afraid of taking the medication because he has an addictive personality and he hates taking medication in general. So a year went by and after too many arguments where he explodes and loses his cool with me he came to the conclusion that separation and then divorce was the solution to our problems, he tell me that he wants to focus on himself, that our marriage has been a sacrifice for him cause he feels he was never happy, we have had our ups and downs but the last thing he said is: I love you but not enough to make this marriage work, what the heck do I do with that? ... our arguments are mostly for house work or how careless he is about everything, he cannot finish a project he starts, he is always on the go go go... hates rules for the kids therefore breaks them and we argue about it, he obviously has what the counselor said... now, he won't listen to reasoning, I want to help him, I love him so much, but he refuses to even hear about him having a problem... it hurts me just like the first time he left, we are living in a house now but he is willing to give up on everything and everyone, I have to find an apartment for me and my kids, he will move with his dad and our family will break AGAIN... I don't know what to do, I don't wanna lose him, I know he loves me, I know this is a stage too, but he has "closed his ears" to any type of talk regarding this issue. I know I should be happy that I won't have to deal with the mood swings and the bad times but I love this man, I want to help him get better... any ideas... I am falling into depression myself... please help us...