I have to go to the dentist?!

I have to go to the dentist?

and i have anxiety disorder even though i have never fainted and have been dreading to go to the dentist for 3 years. I went for my first consoltation he told me i need a filling and onlay. So now I need to get this done latest by Monday because my parents are getting angry. I have been telling myself for the past 3 years the day i get drilled i will like die or its dooms day something like this. Just the whole idea scares me not so much the process because I have been through it before. I also told myself i will never go through this again and keep my teeth health. The onlay is new to me so if someone can explain to me if it soesnt hurt like a filling or if I need a lot of drilling or something?

You will be just fine. See with me I don't like getting the needles. So they give me the laughing gas. See if your dentist has that option. If they do go for it. That just relaxes me. So when I am getting a filling in my mouth they give me that laughing gas.