In my relationship with my husband, I don't find the PD changes to be so much "personality changes" but rather as "personality amplifications." It's like the cute, little, aggravating traits he's exhibited in all our years together are not so cute, rather quite large, and and extremely irritating at times.
For instance: he's always been somewhat of a story-teller. When he goes to explain something, he's often got to give the history along with the explanation. OHGAWD, this bugs the shit out of me! He repeats something that is already determined, and acts like he's trying to sell me on a completely new idea sometimes. I'll get impatient and say, "Look, just cut to the chase. How much is it gonna cost me?"
If I interrupt his story-telling, he loses his place and often has to start all over again.
There was a HUGE argument yesterday. I asked him who was on the phone. He had to start out with, "In the Beginning, God created the heavens and the earth, and it was good..." He got mad because I got mad. It was a lovely explosion.
I am trying to learn how to keep my temper. I know this will only get worse. I really, truly need to put more effort into it, because he isn't going to change his ways. That's just reality.
He gets more argumentative when he's tired. If he doesn't get his afternoon nap, or the nap is interrupted, oh, there will be Hell to pay...