Hi canary:I dont try and explain things to OH anymore. I was once advised to "say what, not why", so I keep communication simple and dont actually say very much to him these days. I also do as karaokePete and make sure that OH is looking directly at me. I dont try and tell him too much at once - he can only retain one piece of information now. Its no good trying to communicate when he is stressed - he just doesnt hear. Even so, we end up having the same conversation repeated.
BTW, Im not a saint - I still forget and try and have a "normal" conversation with him at times, which is frustrating on both sides. My OH has this thing about not being treated like a child too - it seems a common complaint.
I thought when we got married we had a friend for life. But I guess they are friends. I do feel for him, it must just be so confusing for him, it's just so stressful on us caregivers.