my wisdom teeth are getting taken out on Valentines day, and I am in pain, I am afraid my boss won’t see this as an excused absence and will freak due to the holiday, how should I tell her?

So it's basically how I said it, I'm getting all my wisdom teeth taken out. I had previously told her I was open to working Valentines Day because my BF and I don't celebrate it, I'm out of my way out of the store. Put my 2 weeks in, but I want to leave a good impression. My teeth are starting to hurt. I don't know how to explain this to her. I shouldn't fear my boss or have to worry about this, though, you know?? My health should come first. Any thoughts?