I am sorry you are going through this, you are right, it seems (based upon your explanation) that his attitude in general is affecting his happiness and ability to find a sense of harmony. There really isn't anything that you can do to change him, change has to come from within. I think your idea of attending meetings where you can get support for yourself is the step in the right direction. You will also find much support and shared experiences of SR members experiencing similar experiences with family or loved ones on the Friends and Family forum -
http://www.soberrecovery.com/forums/friends-family-alcoholics/
Best wishes to you and I hope that you find your path to happiness!