Enjoy your wine.
It's a normal reaction, gness, and I may surprise you hear, one of love, a love that may be deep in you and having been suppressed by your mother from truly showing, a love that you have experienced the other way around for your kids.
Sure we become frustrated and can have negative thoughts, even become terse with them quite often, though one does try to hold back expressing the really negative "why" questions. So that pent-up feeling has to come out.
So don't feel guilty, you softie.........enjoy the wine.
Similarly related, I am all in favour of having euthanasia available as the Neths and Switzerland do, the decision and paperwork to set this all up having to be done in controlled legal and psychological conditions when compos mentis.
When I look at my mother and how she had slipped back with this terrible degenerative disease (also Alzheimers and Vascular known as Mixed Dementia to thos eof you unaware), I hope that I never have to undergo this. More positively, big strides are being made on the drug front so that is encouraging for we the next generation.