Hell of a cliffhanger to end the season on. I predicted Chuck was taping the conversation and I'm surprised Jimmy didn't realize it as well. He's slipping (pun intended.)
I don't think Chuck is "faking" his illness because I'm certain he truly believes he has electromagnetic hypersensitivity disorder, or whatever it's called. But his symptoms are psychosomatic and when he has a goal he won't display them, like someone who has Munchausen syndrome. Basically he doesn't have any insight into his own disease. If Jimmy told him that he spent his whole hospital stay on an electric bed, like in his previous hospital admission, his mind would just come up with an excuse as to why it didn't trigger his disease.
Kim is really going to get fucked over here. Her reputation is going to be ruined.
Who warned Mike? I'm guessing Gus.