Dom,
From my own experience in the UK, doctors have little sympathy or understanding of the consequences of a head injury. Have a look at the Headway site which have local support groups. Also have a look for the UKabif they have quite a lot of information.
Open spaces, crowds, bright lights, kids, tiredness, emotions are quite common things we all find difficult. We also find that symptoms come and go as we are on the road to recovery.
It truly is a rollercoaster - so hold on tight