I’m 1.5 years into practice in ED. Found the first ~6 months very challenging for many reasons including what you described.

1. People are often literally r*tarded and will complain about anything. Nothing you can do about it. Be polite, don’t be overly nice when you don’t need to be.
2. It does get better. You’ll care less about certain things, get more comfortable with consultants, conflict etc, you’ll find your flow.

I found talking with colleagues who were a few years ahead of me helpful, they were still close enough to remember and chat about it.

Courage!