Phrases Talking About Stress or Anxiety

I'm stressed out.

Meaning

I am experiencing a high level of stress.

John: You look a bit overwhelmed.
Alice: I am. <b>I'm stressed out</b>. This project deadline is too soon!
John: I understand. Take a deep breath. What part is making you <b>I'm stressed out</b>?
Alice: Mostly the presentation. It's a lot to prepare.