I'm going to throw this in here just in case you have the "bush" flag on any of your tiles as the "!" won't allow any characters with that to use bush depth. Then you won't have to add "!" to your player.
class Game_Player < Game_Character
def shift_y ; return 0 ; end
Hero: (Drink 3 HP Bottle L) F.Healer: Don't drink too much,or you got sick! Hero: Nah,i'm okay. it's the way to repleni---
(Hero Collapse) Hero: (Weak) Ugh...my head (Coughing Then Vomiting) F.Healer: I told you to don't Drink 3 HP Bottle L or you're Sick. Let's go to Doctor.