Happy gas?

So I have EXTREME anxiety about the dentist. But I have a tooth that has been giving me pain so I have an appointment scheduled. But here’s the thing - I get the feeling they’re 99% going to want to pull it bc on this tooth, the filling ripped not too long ago while I was flossing and I know food has probably gotten stuck in there and caused problems. I figured bc my anxiety is so bad, that I would probably go on happy gas. Has anyone ever used it? What does it feel like? I’m worried I’m gonna spill tea about myself 😂