Hi Jan
@Jezzer
It is so hard isn't it?
I don't think you are becoming 'numb to pain' or 'shutting down' - rather (as many of us have to do) you have come to the point when you merely accept these heartbreaking changes as yet another step along the long, sad path for your Mum and yourself.
Personally, I am trying hard to get into the mind set, that whatever is happening with my Mum on her dementia journey, and as upsetting as it may sometimes be, at least she is still with me. No matter how she functions, what she can or can no longer do, and despite not being my 'Mum of old', nor displaying the wonderful characteristics that I want to remember her by - she is still my Mum. I love her to bits. And goodness knows, she's brave. I wouldn't want to be walking in her shoes.
Look after yourself.
XX