Grey's Anatomy S.10 Question

Hello.

Ok, so I'm wondering what is wrong with Richard exactly? I know it's something to do with the throat, but what happened to lead up to that? Was it something that happened during the electrocution? Or perhaps during surgery?

And the next thing...During the last few minutes of one of the recent past episodes, sorry, not exactly sure which one. Richard is doing the narrating and he's talking about making the right choice about his "end of life care". We're supposed to think he's talking about Meredith and choosing her as his executor I think is the right term, not sure. He wakes up and he's looking at a smiling Meredith. Now he's all pissed off at Mere for keeping him alive.

I'm a little confused . And I'm a self proclaimed Grey's expert!

Can anyone clarify?