Hey there! Sorry to hear about your jaw but you have NOTHING to fear
2 years ago I had an ovarian cyst (10cm x 14cm - Ginormous!!). To begin with they didn't know what it was as I only had back pain. Once they found out what it was they scheduled me for surgery - very scared!!
I was only 17 so they let me have my own room (instead of the wards). I had several blood tests and those little things in my hands (very happy to have them out!)
I remember being wheeled to the pre open room, I was getting very scared as it was ACTUALLY real! The lady was very nice, told me to count back from 10. I remember getting to 7, then I remember waking up again in the pre open room. Apparently, I went 10, 9, 8, 7, 7, 7, 7...
It isn't anything to worry about, and the scar I have is really well done (it is almost invisible!). If you are worried, maybe take someone you trust so when you wake up you have them
Best of luck x