I had a frenectomy a few years back.
First of all, she is not trying to murder you, she's trying to help you. Do you know why you're getting a frenectomy? You're probably tongue-tied, which means the little piece of tissue under your tongue is a bit too short and holds your tongue down too much, and that may have harmed you in the past. Can you stick your tongue out really far? Do you drink liquids like everyone else? Did you have a bad pronunciation when you learned to talk?
She may put you under local or general anesthesia, I had general and everything was fine. They simply snip that little extra skin under your tongue to free it. Then they stitch it up. I had about 10-11 stitches and they melt after a while.
The worst part is after the surgery. When you wake up you're still drugged, and they give you meds to bring back home, but when they wear off it hurts.
For me, I could NOT eat for almost 3-4 weeks. Drinking was barely bearable. I lost a lot of weight and a lot of energy, I was exemplted of a few classes at school because of that.
The stitches hurt your tongue and when you move it. For me, it was hurting all the way up my ear canal and in my ear. My jaw was like locked or swollen, I could barely open up my jaw to brush my teeth or drink. (To drink, I'd put a pit of sweet juice in a spoon and put the spoon down my throat and tilt my head back, to swallow without using my tongue) After about 1 month I could eat small pieces and drink more, gained some weight and energy.
Now I can drink, french kiss, talk well, etc, and I'm happy!
My own experience.