I do believe he was hanging on until he could get back onstage for one last time. I think Back to the Beginning wasn't for the fans, it was for him. What a way to go out. RIP.
I think relief and a sense of peace. I'd like to think he wasn't tearing his hair out going "Now what?"Sharon outright said it was to "give him something to live for", which asks the question, what was going to happen to his mental state after the gig was over?
I guess the man really wanted to play that final show, and his body gave up and failed after that. Really sad.