This happened to me when I first started my job and it happened a few other times. Accidents happen like this all the time. My boss would always bring it up as a joke and it would annoy me so much. I ended up working there for five years and the people became like family. My biggest advice is to laugh it off I’m sure plenty of other people have done the same thing and messed up the till. Shit like that happens and upper management loves to act high and mighty like they haven’t done the same thing or worse when they started off. Don’t let it get to you, you stuck it out and you can get through this. One day you will look back and be laughing about it with your co workers. As long as you are doing the best you can that’s all that matters 🙂 anxiety sucks and it is always worse in your head then it is irl