'Bellyache' is totally fictional. I like writing about things that aren't real. The song is about not trusting anyone and then putting trust in yourself and realizing that you don't know what you are doing, either. Or realizing that things you do with a group of people that you think are cool in the moment are ultimately all on you.
I don't want people at my shows to come out and say, 'I just saw a cool show.' I want them to say, 'I had fun at the show.' I want it to be a collaborative thing and be part of the audience and have them be part of me. I try to interact with everyone there and have them be equal to me because they are.