Oh, Jim. My heart breaks reading this. I was there, too. I was Dad's end of life caregiver. Washing and changing him, holding hands and talking at 3 am. Chasing the ambulance sobbing, just wanting one more hug. Just one more. But no.
It's a hard road you're on. I well understand when you say no regrets. I would do it all over again. Take care of you.