Struggling with guilt over my mum's dementia

I'm a married man in my 40s and my mum, who's in her 70s, has had dementia for a couple of years. In this time, she's gone from being a sweet, kind person to someone who's really aggressive and verbally abusive.

- Dear Coleen

Sadly, my kids get frightened by her when we visit her in her care home, so I've stopped taking them. My wife is very supportive and has gone over and above to help, but I don't want to burden her too much with how I'm feeling, as she has other things on her plate.

I don't feel I have anyone else to talk to about it, though, as I'm an only child and my father died years ago. None of my friends have any experience of a relative with dementia either.