Sorry for your loss. I feel for you man. Have recent experience here.
It's very impressive the care you provided for your Mom.
No matter how you prepare yourself for the inevitable you are never fully prepared.
Dad passed away the last day of '21 at 98. He was a stout 97 until he broke his hip in March, never came back total after surgery and had complications from cancer. His health started declining rapidly in his last three weeks.
Mom passed away in 2017, three years after suffering a severe stroke. Broke my heart to see her slowly decline. There were days she didn't know me. Her last ten days were under hospice care and the last three days on morphine. That hurt. I had to make peace with that... better place now.
I have to think quality of life here.
Regarding anger: there were numerous instances between Mom and Dad's care from doctors, nurses, facilities etc. dropping the ball in my view that hampered their recovery. I was furious but I had to let it go. It's in the past, no fixing that. I can't blame you though for being angry.
Things happen fast. Dad managed Mom's funeral arrangements after she passed. He was 93, I only assisted him when asked. Dad passed just after 4 a.m., I was there by 4:30. Funeral home called before 7 a.m. He was transported before 9 a.m. We had a meeting at the FH at 11 a.m. for arrangements.
It was four days of almost no sleep. After the burial and brunch for family and friends I got my beer on then slept for 12 hours.
The memories never go away. I've been working at the folks home sorting and cleaning out. I'll find pics, papers, notes etc. that make me stop and relive the times, time well spent. I've been doing plumbing too. I run across something and think how did Dad do that? I'll have to ask him. I still do that seven months later.
Snowdoggie, you are a good son. You took great care of your Mom and went above and beyond. You should be very proud of that.
Best wishes.