I'm a project manager now but I used to work as a programmer. Deployments STILL make me nervous and I'm the "client" now.

Check, check, take a break, check again. See if you can get someone to look at your stuff before you deploy.

Look into mindfulness meditation. Also I know it's hard to relax when this kind of work needs you to be perfectionistic, yet it's not always possible to find and fix all bugs and errors.

Many a time, something we've tested perfectly fine on pilot users (workstation software patches) breaks when we roll it out. People will complain, it's part of the job. Remind yourself you did your best.

Have you heard of "the worry tree" for Generalised Anxiety Disorder? Focus on what you can control. And what you can do to fix stuff if it blows up.

Medications help me, to be honest.

I hear you.