Over here the FAA has the same rules for seizure disorders ("epilepsy" is a lay term!) and does not allow even a third class.
The way I've had this explained is that the FAA would be willing to change the rules for things like long term medication-controlled seizure disorders, antidepressants, and the like. However they require that the medical profession guarantee that the condition will not be incapacitating at some time in the future, and of course no such guarantee can be given, because there is no objective measurement which will accomplish that. They've approved a few diabetics at least for third class, but the hoops required are considerable, and there are some tests which can be used