My initial class II is being deferred to Gatwick because I had a head injury 7 years ago, and this is despite me never having had a seizure or epileptic type event and not requiring any neurosurgery or suffering any cognitive defect! The JAR-FCL 3 is pretty clear and the JAA, CAA are rightfully cautious.
My AME is hopeful I will get a class two as a consultant neurosurgeon reported my risk of developing PTE ( Post Trauma Epilepsy ) to now be similar to that of the general population. i.e. < 1%
However if you have ever had a seizure the prognosis is not good, especially for a class 1.
As others have pointed out examine your medical records closely and make sure there is no inaccurate or misleading diagnostic information. The AMEs can only work with what is provided to them and it may be worth obtaining a consultant report to clearly paint an accurate picture of your history and current status.