NQN2017

I was wondering if it was just me. I recently qualified a month ago and I am working in a critical care environment. I am due to finish my supernumary period soon and I am so nervous to go at it on my own. The night before my shifts I get so nervous and I can't sleep. I lay awake all night thinking about the next coming shifts. I feel like I don't know enough to work in a critical care environment. On shift I find myself staring at the cardiac monitors of my patients and hoping nothing happens. I get nervous thinking about speaking to other doctors. I feel I don't know enough. I'm so scared all the time. And I'm second guessing even doing nursing. I've actually always wanted to be a practice nurse. I am going to try and stick it out for 6 months total and then try and get another job. I can't live like this. Constantly scared for each shift. My partner thinks I've changed and I'm so anxious now and not myself. I don't know what to do. Anyone else been in the same position? Help