Your feelings are perfectly normal. I've been a nurse way to long to admit but still have the occasional anxious obsessive thoughts. I think it is a sign of a good, caring. conscientious nurse.
There is a saying. Face the worst, believe the best, do the most, and leave the rest.
However take the first part to the extreme. When you start getting anxious and obsessing take it to the max. Let your imagination run wild. Go crazy.....you are going to give every patient the incorrect med, the wrong dose, etc. You are going to seriously harm if not kill one of your patients on your next shift, etc.
The entire BON, the director of the hospital, the doctor, all are going to stomp into your unit and strip your name badge off your uniform
. A drummer will slowly bang a drum as you walk down the hallway hanging your head in shame as your co-workers point at you and whisper.
The "best" part is you will not be a nurse anymore and don't have to deal with this anxiety and obsessive thinking.
Well.....I have a pretty good imagination, but I hope you get the idea.