Can positive changes occur (and last) WITHOUT medication?

Hello everyone,

We go tomorrow to get the final verdict on my husband's ADHD test.  I am convinced he has it, but now we'll see what the "professional" has to say.  Regardless of the outcome, my husband has made it clear (actually gotten quite nasty about it) that he WILL NOT...NO WAY, NO HOW...EVER take medication for it. 

So, I'm curious to hear what sort of success people have had with partners who have chosen NOT to get medicated in response to their diagnosis.  Is there any hope that any sort of long-lasting change can happen if a person isn't willing to address the brain issues that are causing them to act so erratic?  I can't say that I'm that hopeful that anything would permanently change if he's not willing to at least consider medication...I've been through too much counseling with him already, and unless someone is holding his feet to the fire, he just back slides into his same old self-absorbed, crappy behavior. 

I'd love to hear from people who have been there, done that, so any thoughts would be greatly appreciated!  THANK YOU, in advance!!!

P.S.  If anyone has any tips on how to find a good, competent therapist with a sound knowledge of ADHD in adults to help my husband manage his "issues", I'd love to hear them.  Thanks!