have you had a post-orientation meeting/review with your clinical supervisor or manager yet? Often that interview comes around the time you finish orientation and its a good time to evaluate how you've done. Maybe that would be a good time to discuss if you've made a good fit or not....sometimes I believe they will let you transfer if its clear to you both that its not working out.
But reading your stats, you've been a nurse as long as you've been in the ED....thats a hard place to make the student-->grad--->nurse transition. I would really try to give it a little longer.
Although I am in ED now, I started my career elsewhere and I will tell you, after the first few months I HATED it...the hours were no fun, the patient load was too much, and coming off orientation I felt I"d lost my safety net and I wanted to transfer too..but I stuck it out and a few months later I had this surge of confidence...kind of like "Hey, wow, I am doing this and I haven't killed anyone!"

You might very well be in that place soon too. Reality shock hits us all at some point, and its very possible you are feeling that as well.
Give it a little more time. You can always ask that your orientation be extended a few weeks, and see if that helps.
Good luck!