ADHD vs ADD....what is next when it's not what we thought?

Hey all, so my spouse has now confirmed he has ADD and not ADHD like we had both originally thought. And I feel so....lost? As in, it was a bit surprising that he doesn't have ADHD but I'm not sure it will really matter in the long run, there's now a lot of work to do on it and I'm not sure which way to turn. I mean, all the things I've learned about they still apply? I know the next step is to push for couselling for both of us, I think it's a deal breaker for me, but I also feel confused about that too. Not sure if that is the right next step or what. I know no one here can tell me what to do (as much as I would like that to be honest), but what have others done when a diagnosis finally (!) happened and now it feels anti-climatic or just, deflating? 

On a side but relevant note, I have been hearing the suggestion of the non-ADHD spouse (me) about reading Boundary Boss and I finally got my copy and I'm super excited to get in to it. But that also feels overwhelming too like that is not what I should be doing? (my therapist would kill me if he heard me now... 'coulda, woulda, shoulda') 

Anyone else ever get a different outcome/diagnosis they weren't expecting but it didn't seem to set the world on fire and what next steps did you take? Just curious.