I'm going on stress leave and writing an email critical of my boss
What is causing you so much stress at work?
My boss has been breathing down my neck lately.
It is good to take a break from stressful situations. It might be helpful to tell someone how you feel and writing an email might help.
Well I just want to get it out if my system. I can't even talk to people about it since I'm not supposed to and I don't want to go to a doctor
If work stress is affecting your health, then it would be best to go see a doctor. You could schedule a virtual meeting with one or perhaps seek out friend and family that have had similar experiences dealing with work burnout.