I'm an old woman so it sure won't be the same for your 12 year old

but I've had the VEEG
twice in a university hospital and I've had no problems at all. Sure it's no fun but but I was happy to see the amount the doctors were learning about my seizures.
My first stay before surgery in 2006 was 4 days and my last stay, this year, was 5 days. Both times I had my "usual" complex partial seizures after reducing meds.
My husband refused their offer to spend night and day (no charge) with me.
I took lots of books, embroidery, cross word puzzles, stuff like that. Food was awful but I did just fine.
They tried to "force" me to have seizures so there were "tests" with the 'light shows', bikes and things like that. Time went pretty fast.