@victory0716
Good Morning Victor
I am very sorry to hear that is happening to your son.
Seizing does affect the speech of a person. When I have a seizure, depending on its intensity I can stay 1 hour without being able to speak. My seizures are mostly complex partial ones (I get absent). I had a convulsion (tonic-clonic seizure) once and this was even worse.
What happens to your son when he has a seizure? Does he fall to the floor and start jerking or is he just absent? The Epilepsy Foundation has great material on seizures and might be helpful to understand the kind of seizures your son has. Here is the link to types of seizures: https://www.epilepsy.com/what-is-epilepsy/seizure-types. Understanding the kind of epilepsy and seizures your son has is very important to define an effective drug for his seizures and to have success in the treatment.
What kind of doctor is treating your son? An epileptologist would be the most indicated, especially for those who have drug-resistant epilepsy like me (around 1/3 of people with epilepsy).
Wishing you and your son all the best!
Chris (Santosha)