Excalibur has given very reasonable advice, and there is a real possibility of redundancy if I repeat the same thing. Nevertheless, there is one additional suggestion that I have, which may seem counter intuitive; get away from Cambridge just for a day. Not home, but just away, a friend elsewhere, or just a day trip. I need to do this quite often otherwise I become extremely misanthropic and increasingly cynical. However, I suggest you stay to the end of term. There are things coming up, not least the TSR formal, plus we all occasionally post statements showing that we have a real social life and are going out/are hungover (see me, above). Nobody here will say no to having more company ... we are surprisingly, erm, communal for an internet community.