I am in a strange limbo state: too tired to sleep and too tired to do anything useful. I tried reading email but I doubt I could provide anyone with a coherent response. I considered logging into Skype so that I could chat to some people but I can’t get my brain and my mouth to work together. My body is confused and I can’t work out whether I am hungry or thirsty as I just feel queasy.

I am horrified by the thought that within a month I am planning on taking another 12 hour plus flight. Hopefully in the next day or two I will start to forget how dreadful I feel at the minute.