Good Morning @ldlauwers
I'm sorry to hear that zonisamide did not work for you. Indeed, some AEDs can cause depression, as I experienced myself with Tegretol (carbamazepine).
I've never heard of Sympazan, but I looked into it a bit. Sympazan and Onfi actually share the same active ingredient — clobazam. I'm not sure why the depression risk would be different between the two, since it's essentially the same medication. It might be a good question to bring back to your neurologist, just to understand the reasoning.
@jemollica and @stepklin have experience with clobazam, but I don't know if they've used Sympazan specifically.
How has your mood been lately? Are you having any therapist support at this moment?
Chris