Hiya Daisy!
Yes, 100%. I have always found this frustrating as my family and friends’ travel insurance is always so cheap! When I travel or go on holiday, I usually go onto comparethemeerkat.com and just pay for the insurance that covers everything. It is usually expensive but I cannot seem to find anything else that is cheaper.
However, I know there are travel insurances specifically for epilepsy. Try these and good luck!
https://www.able2travel.com/epilepsy-travel-insurance/?campaign=google_ppc&gclid=Cj0KCQiA3smABhCjARIsAKtrg6LfVJ8zkGT2QKkVQJvLrkB7XA6VziZMRjCvt60tMsbVS4wWlet70c4aAs90EALw_wcB
https://www.insurancewithpartners.com/EpilepsyAction/quote/
https://www.goodtogoinsurance.com/medical-travel-insurance/epilepsy-travel-insurance
I hope these help! 
Liv 