Epilepsy and migraine are linked in the minds of the medical authorities. I find it odd that Migraineurs can gain/regain a license so quickly - albeit restricted to multi-crew operations only.
The pilot you're referring to was an instructor at Oxford in the early 60s. In those days such a problem was referred to simply as a 'tick', despite the rather alarming outward symptoms. Despite this, he pressed on with quite a successful career. According to one of his crew, the problem calmed during increased pressure, of for example, a demanding approach.
Certainly, in his last job at retirement age, he was much liked and respected by his crews.