Replying to Good bye grandpa

So my grandpa died this morning after a long battle with stomach cancer. He wasn't able to eat any real food for a year and a half( save a specific brand of those little crackers sandwiches with cheese in the middle) until about 3 weeks ago. He was looking better and was even moved out of ICU into a middle floor of the hospital, not cured but looking better. Then some nurse was teaching some interns and she accidentally cut his pick line ( google if you don't know what it is). Not a huge deal they just replaced it. But the replacement was infected so he got sick again, back to ICU and no more eating. After a specialist came in she realized it was the pick line that was making him suck again and they got a third one, once again he started to come back. That was all about a week ago. Then he started to develop an undiagnosed pain through his body and I don't know the details but he died this morning. I'm pretty much in shock still but was wondering of the pain could be related to the mistakes made previously. Anything helps and R.I.P Walt Luck