My advice would be to get your medical records, see your GP, and seek a private referral to a specialist. You need their opinion as to the risk of you having another seizure and whether it genuinely is less than 0.1%.
If they say yes, ask them to write to the CAA on your behalf and tell them this. Obviously there's a cost to this, but it's the only way. In my experience, the CAA will defer to a specialist opinion. This is how I got my class one shortly after a fairly invasive eye operation.