I found the likely answer to a deleted answer that was kind of a request for ID of another book on 70's/80's Short story man uses PC to compensate for progressive memory loss then they die in suicide pact and I figured it was worth posting for if anyone else is looking for it.
I remember one that's similar but I can't remember the title either! The first scene is him with his mother, watching her dying in bed of Alzheimer's and swearing to himself that he'll never go through that. The next scene is him waking up and the computer, his self-programmed AI, telling him the title of the song. His name is Rush. He is led through his days with the help of the AI,and the POV is wherever he goes, not the room. I vividly remember a cab ride and him removing things from his pockets so the AI can see what they are. It ends with the AI solving a murder, and having him build or get a bomb so he can kill the bad guy and himself at the same time at the end.