Advice please

Hello everyone - Linsy here. I need advice about accompanying my husband at last to see the specialist ADHD psychiatrist, and how to manage this event. 

What do you think I should do that would be most helpful? I think I should sit quietly and continue to be supportive. I married the guy in sickness and in health - it has been very very difficult, but he is still my husband and the father of my children. And I will go through this in order to help him find peace and restore at least some of his damaged relationships. Thanks for anything any of you can advise.