F97,
OASC will get access to your medical records. If it says that you have had a migraine you will be classed as Permanently Unfit for GD(Air), FC and ATC. However, if you have a ditty to 'prove' that the GP was a muppet, er misdiagnosed your migraine, from your neuro specialist, I suggest that you ensure that it finds its way to the President of the Medical Board, probably via your GP.
Good Luck.
Kipper
