Made mistake at work

So I made a clinical judgment error on Friday. I am going to be written up and possibly face more disciplinary action. I feel so ashamed of myself. I let my stress get to me and affect my performance at work. At this point, I no longer want to be a nurse because I feel I just might not be able to handle it. I'm dreading going to work on Monday and having anxiety just thinking about it. I feel so humiliated that my coworkers probably think the worst of me right now. Any advice?

There's a lot of emotion in your post, but very little information. Being written up AND possibly facing more disciplinary action suggests something fairly serious, unless your manager didn't actually indicate that and you're just worried about being punished some more.

It's always bad when something happens on a Friday and you get to stew all weekend wondering about the consequences.

The only advise I can give you is to stay calm, own up to whatever you did (or didn't follow), don't make excuses and have an action plan ready to discuss with the manager to show that you never want this to happen again.

As far as your coworkers? You would be surprised at how little they are probably actually thinking about you in general and the incident in particular. It's human nature; we are rarely uppermost in other people's thoughts at any given time.