My anxiety problem

I got a new job at a day care. I have never worked with children and I'm going on my 3rd week working there, and I get this overwhelming rush of anxiety that make me feel like I have to throw up the night before and mainly an hour before I start. I have always worked in the restaurant so I felt I needed to switch things up and I did. BUT..... I have never had this feeling and if so it especially was not this long. What do y'all think this mean? What should I do?