Ive felt the same way when going to the dentist.
I know no matter who is there they r going to take my money. And lots of it.
There's been times when i feel some anxiety coming on but i still call and cancel bc 1. I know they note everything about each client even off behaviors and 2. They charge a $50 cancellation fee on your next visit.
Best to call and cancel beforehand bc its a wonderful gesture and respectable thing to do. For any appointments u can thunk of; massage, hair, nails, teeth, lab, dr, ect