Dear Roseann,
my aunty didn't swear during any stage of the illness. My nan did occasionally, and we were mortified because this was a gentle, kind, loving woman who never EVER used bad language. But in the nursing home where both my nan and gramps were there were a few ladies and gentlemen who used the foulest of foul language towards relatives, carers and visitors. The staff dealt with it in the nicest possible way, and we all knew it was the illness that caused them to lose all inhibitions. They didn't know half the time that they were doing it. But the words I heard in there sometimes made me blush...and I'm no prude.
One of the men was particularly bad and on one occasion when I was taking to a nurse in the same room, she said "I used to know him before he got ill...he was a teacher and the gentlest, kindest, politest and most considerate man. He would be mortified if he knew what he was saying." He just couldn't help it...he didn't seem to have any control over it. Sometimes it seemed as though he was really angry, and it might have been his way of venting his frustration in this situation when, in former times, he would have been able to use different, slightly more refined words.
Not much help, Roseann, but just to say it does seem to happen and doesn't seem to be uncommon.
Best wishes, Tina