The migraine has subsided! For my last 2 weeks in England and week in Rio and Sao Paulo I have had one brutalising headache. The constant need to do things, the constant party and the struggle for sleep had all played their part in this, but finally it has gone.
The main contributing factor to the end of this migraine: doing absolutely nothing. For the past three days I have done nothing other than sleep, cook, eat and walk. My only spot of surfing leaves me looking like the japanese flag as my sun tan lotion application skills truly fail to hit the spot.