None of these things are related (except, perhaps, that I got even less sleep last night than I would have otherwise, thanks to the pain), and most of them are things I can do nothing about. Bring a more comfortable chair to College, perhaps. Bring some slippers so I don't have to sit in my shoes all day.
These really are a bunch of First World problems, aren't they? Here I am moaning about being uncomfortable when I'm in a heated office with electricity, and clean drinking water and a not completely unhygienic toilet round the corner. Ah well.
Edit: 20:15 I am now sitting cross-legged on the floor and feeling much happier.