Are These Just Excuses?

My husband was diagnosed with ADHD about two years ago.  I have been doing a lot of research on the subject and know what most of the more "common" symptoms are but my husband blames EVERYTHING on ADHD and it has already gotten old.  He blames everything from being hungry, tired, hot or just about anything he could think of at the time for his bad behavior.  I know that these things can effect anyone to a certain degree but his behavior is extremely out of control. Could this really be because of ADHD or are these just excuses?  My kids and I feel like we are living in a prison.  He gets mad at us for every little thing.  We feel like we are walking on eggshells all the time.  I have tried to talk to him about this a million times (in a nice way) and he agrees that he is wrong but it just continues over and over again.  I am at the point now where for the last month or two I have been threatening to leave and he says he will change but it's still not happening.  My kids don't want to even live with him anymore.  He gets frustrated over the slightest thing.  He thinks EVERYTHING is a problem when it can be something as simple as him driving my son somewhere or having to go to the store. He is always taking my stuff behind my back and losing it.  I have to hide everything important. I could write a book on the stuff he does. He was on meds and they didn't work so where do I go from here?  Is it maybe that he was on the wrong ones?  Does medicine work for everyone with ADHD?  I can't live like this anymore and am ready for divorce because my kids are getting hurt now and I don't know what else to do.