Don't get rattled. I felt the same way when I first got out of orientation. I was very, very unsure of myself, and looking back at some of the mistakes that I made (I accidentally bolused an entire bottle of propofol over 15 minutes instead of Keppra...yeah I cried and almost quit that day) I realize how far I've come.
It sounds to me like your manager is not being very supportive of you. You have only been there for six months! Of course you are going to struggle and make mistakes. Is there anyone else there you can talk to/confide in?
If you truly love ER nursing, my advice would be to not give up, just take one day at a time, that's all you can do. Look at the mistakes you make and learn from them- unfortunately, they can often be the best teachers in life. Like in my case, after making that med error, I became extremely careful with all medication administration and still am to this day. Remember, you are still really, really new at this, and at this point, no one should expect you to perform in the same way a seasoned ER nurse would. Don't be afraid to ask questions or look stupid, either. To me, the nurse who asks the questions is a lot more trustworthy than the one who thinks they know everything. Being a SAFE nurse should be your #1 priority. So keep looking out for your patients, and know that everything else is going to come with time.
And be good to yourself- when you are off, go out and have fun, do other things to take your mind off of work. Enjoy your new career and know that it really does get better- there is a huge learning curve just within the first year as a new nurse, and in a few months, you won't believe how far you've come!
