How to confront my husband about his ADHD symptoms?



I need some direction on how to bring this up. A little background; We've been together for 13 1/2 years. But only married for 9 months. Up until we got married and living together, I contributed his symptoms to self-centeredness and fear of commitment. This was our only focus during couples therapy. I realize now (even our therapist missed it) it's ADHD. Now that we live together, I see and live it daily! It's tearing me apart inside and I don't know how to confront him with it. He's very sensitive and will take immediate defense. That I'm sure of. 

A little background of me; I'm in my mid 50's, both on second marriage with adult children. I have a full time job (career) and own my own business. Because I'm so spread thin, I have a tendency to sweep things under the rug until I'm physically & emotionally exhausted. I like to call it, choose my battles. I'm now at the brink of blowing up. Any suggestions and ideas on how to address this in a loving way is greatly appreciated.