It seems a bit soon to leave you in triage all by yourself -in the facility where I work, you have to be an ER nurse for a year before you are even precepted to triage. Let your preceptor know that you do not feel safe being left on your own so much, and take a deep breath. You are there to learn right now, not run the show. As far as I'm concerned, ER is about judging whether the patient is sick or not sick, compensating or not, prioritizing what needs to be done now and what can wait, and ABC's. Good luck, hang in there, 4 shifts is just getting your feet wet.