I understand how you feel at the moment. I procrastinated visiting one of my senior friends until he died. Yesterday made it two years I got the news about his death and reading this now the memory all flashed back.
Just like you said, taking action immediately you get the prompt is the best way to keep one from having regrets in the future and this should be applied in every area of our lives.
It's indeed good to take a prompt action. We can't specifically tell why we have those prompting