Again, I can relate. And I am so sorry we have to deal with this.
After my Daddy died, I tried to spend more time with my Mom too--to try and fill the void. She also said since he had been in and out of the hospital and then at dialysis 4 hours a day, three times a week for so long she had grown accustomed to his absence. But it still broke my heart--for both of them and their loss. Unfortunately she was also sick and diagnosed with SCLC two months after his death.
I miss them everyday.