I hated to see your post on my thread. I remember when you left. Victorious.
Don't you think sometimes the op should just be subjected to a good old fashioned ass whippin'? I do. Especially one that persists as the one in your sitch has. The high road sucks so much of the time on this journey... And we have learned that the op is not so much the problem as they are a symptom of it. Even still....
cat, I have not been in a good place myself the last couple of months so I don't know that I can offer you anything other than what you already know. You have to go dark. I believe you are at the point that your battle clearly belongs to the Lord. You have done as much as a person can on their own. It's time for your husband to put up or shut up and making excuses for him is not serving either of you well. Sympathy and understanding are one thing. Enabling is another.
Your husband has to want to help himself as far as the ADHD goes. It's not an acceptable excuse with so many treatment methods available. Until he gets that help, I'm afraid you are wrestling demons that don't belong to you.
Step back, pray a hedge of protection around him and give him a chance to man up.
I'm sorry if this isn't what you wanted to hear from me but it is a response I have thought about for several hours after reading your post.