There are a few on these pages who know more about medicine that I and some may express their more expert opinions for you. However only the CAA will be able to answer your real question as to whether it's worth taking a medical.
A Class 1 is not quite the same as a bath tub of course but the CAA do adhere to a ten year protocol which in turn is linked to there having to be a reasonable medically sound explanation for any epileptic fit. Have you really an established history of seizures or have you ever been diagnosed as an epileptic? If you can substantiate the statement that you haven't had a seizure for eighteen years and then only transient as a child, it is surely worth the gamble of the medical fee. Once you've passed the medical you'll be able to start down the road of seeing whether you can become a pilot.
Good luck.