Is it normal to panic?

I recently just ended orientation and I've gotten all positive feedback from the managers and co workers and its great.I love my job...I think...and I mean its been such a smooth transition from recently graduating to working on my floor...but...I'm deathly scared. I'm panicking, I feel like the whole world is on my shoulders and I can't shake it off. Just thinking of going into work is making me sweat and I'm worried its already been a week since I've been off orientation but I'm so flat out scared and I can't figure out why I'm like this which adds to my anxiety. I know that my co workers are there to back me up but just the fact that I'm now officially off of orientation is scaring me. I'm now thinking maybe I don't love my job maybe I just think I love my job and blah blah...I know I'm going overboard I tend to think of the worst possible situations but I can't shake it and that worries me more...I just want to get feedback of if this anxiety over nursing is normal or if I need to get some serious help or something. Its kind of the same feeling I had studying for the boards but a little different and I can't pinpoint it....