I totally understand...that actually did happen to me but you just tell them you're overmedicated. That's what I've learned here on PC. You have the right to have a say in your care and feeling like a zombie is an unacceptable side effect for you (I know someone who welcomes it). For most people that is not a tollerable side effect so you would just say "not working". Hopefully they will just do some minor tweaks and you'll just feel better. Try to stay as positive as possible, going in with a positive attitude will really help you. Just do your best, I know it hard, I know it's scary but once it's over it will be no big deal....the fears will go away once you get settled in a bit. You'll usually get a little tour and they will give you a booklet with your rights, read through that so you're informed. It's good information if you decide you want to leave for whatever reason. But give yourself time to adjust, you'll do great!