@Wellzizizbetter DD1 has never really been able to tell us much about how she feels after a seizure, apart from she has a headache, or she has pain in her muscles; so she could never say
“I’ve felt wiped out for the last three weeks since that last seizure!”
Partly, because she’s never had three weeks between seizures; but mainly because she can’t quantify how she feels pain, exhaustion, brain fog, etc. Once, she couldn’t speak for several days after being in non convulsive status (a frequent occurrence in those days).
However, DH knew a boy at school (a grammar school, so quite able), who had tonic clonics - he was wiped out for several weeks after one.
Maybe, it’s the same for your DS? I think some seizures are bigger than others, even though they look the same.