Dreading appointment tomorrow

I have not had dental work done in fifteen years. I've kept up fairly well with brushing, but could surely improve more flossing. I have however, TMJ pain often, so avoided dentists so long. It simply hurts too much to keep my mouth open for a half hour to an hour.

But I noticed what MAY be decay or the start of two cavities in my back molars. They said if the dentist needs to fill it , he can do it tomorrow after examining it.

They'll give me breaks too to close my mouth. But another issue is vertigo..I ALSO have a misaligned jaw and any little pressure on my cheek near my ear, can give vertigo. Of course the work possibly needed is on that side where my jaw is misaligned, so I'm do nervous that the drill will give me vertigo. I do have ice packs and motion sickness pills. I just hope it goes ok. 😕