A couple of other things that will really help out (in addition to the sage advice given here):
Realize EM is shift work. If your shift starts at 7am, that means you should be ready to accept sign out at 7am. Not 7:05. If you need time to get your coat, your coffee, put your stuff away, get there early and do all that. When its time for your sign out, you will understand.
If a pt seems really sick, unstable or in severe pain, come out and ask for help. Don't interview and read and work up a patient first. Give the attending/senior a heads up.
Don't be afraid to ask for help.
When creating your assessment and plan, create a differential and come up with a plan that matches your differential. As an intern, its important to also talk about the things you thought about but don't think the patient has. (ie, the patient has chest pain that you think is msk, let the attending/senior know you thought about PE, PTx, etc and briefly why you don't think it is those things) Avoid anchoring and avoid ordering tests 'just because'.
Consider 'running your board/patients' every hour or so (this means sitting down for 60 seconds or so and goign through all your patients, what you are waiting for, what you need to do, etc).
Be considerate. If you are having a down moment or two and you see everyone else running around like crazy, ask if you can help.
If you are getting overwhelmed, stop and ask your senior or attending to help you reprioritize what needs to be done. The multitasking that gets done in the ED takes time to learn. They can help you figure out where to spend your energy.
Enjoy yourself!
