Hey Jack I'm so sorry to hear this. My brother has epilepsy and a cousin has some weird non epileptic seizures. I would come straight out to the doctor. I get pretty emotional and passionate about cannabis and epilepsy so I apologize if I rant...
My brother's neurologist handed him a book about cannabis and epilepsy. And had to tell him I can't advocate for you to use MMJ because it isn't leagal..... BUT I wrote the first few chapters of this book. Lol.
I am a father also so I can totally understand wanting what is best for your children's health. What I would tell your doctor is the truth.... the meds don't agree with your child. And you don't agree with continuing to give him meds that arent improving his overall quality of life. Say you want a more homeopathic remedy like CBD oil.
Now your son may still need meds but likely lower doses or a more mild prescription. And if the doctor says no. I would get a new doctor. There's no excuse for not giving your child a safer all natural medicine, when the option is a possibility. And as a parent I'm sure you agree our children's well being is not up for debate or discussion... it is a MUST!
hope all is well and btw, plants looking happy bud