I have to have a tooth out on Saturday with only local anaesthetic

. I can take 5mg of diazapam before I go but I am dreading it as it brings back memories of childhood having gas with that awful black mask over your face and the horrendous dreams etc ....
I have to have surgery ie they have to cut my gum to get the tooth out. I'm so scared ..... I hoep I don't cry or anything. I know I'll shake real bad. I know i wotn have gas but it just makes me scared. Just needed to write this out. So I've voiced it. thankyou for listening. me x

I'm really quite scared.