If management is aware, would it be helpful to do some re-training on procedures, or leave yourself reminders on more complicated procedures? I sometimes will sometimes tell a customer I need to check with my manager or get my manager to sign off on something if I'm not sure of the procedure--it's okay to not have all the answers right away if you are not sure, especially if this is not part of your normal routine.
I was getting into trouble periodically because I was giving cost estimates for jobs that were too low. These were for really long-term jobs like web site development, and I was underestimating the amount of time I would need to finish the project. We're not allowed to go over the estimated cost unless the client changes the scope of work or requirements, so I was having to do several hundred dollars worth of work for free, about every three months. Finally, my manager decreed that I submit all my estimates to her and another web developer before sending it to the client. She decided that was such a good idea, that everybody should have their estimates reviewed, not just me, so it was good for the team.
My point is, try to focus on solutions instead of panicking--how can things be improved for the future? Changes in procedure? Training? Somebody to check your work? Asking more questions? Sticky note reminders? The solutions that help you may help other people on the team--and that's a win!!
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Diagnosed Bipolar II in 2012, Autism spectrum disorder (moderate) & ADHD in 2015.