Thanks everyone. Glad to know that DS is not the only one, if you know what I mean.
I think most of his irritable moods are borne of frustration when things don't go as he'd like them to and there's absolutely nothing that he can do....other than to accept it and move on, or sulk about it. He's just not as likely to take things in stride and carry on, but he is getting better (as I realize when really looking back).
Sometimes, it's just draining going back and forth. I need to strive to remember that as an adult I've had plenty of experience adapting - and I think I forget that with DS sometimes.
Anyway, thanks again.