Overstimulated

I’m at the dentist rn and they numbed my face up a lot and I started to get really overstimulated and freaking out and not being able to breath. Ofc I’m wearing a binder when I’m hyperventilating but I can’t just take it off:/ i feel like throwing up and crying rn but I’m trying not to including cause if I do I’m gonna waste time for this appointment. Gahhh I need to forgive this shit out :( Anyone have any ideas?? When I’m overwhelmed I just make some sounds so help or when I’m excited and I move a lot but that dosent help when I’m very overstimulated.