Work Mistakes with MS

Does anyone make huge mistakes at work since having MS? I have been struggling along time at work make mistakes. The harder I try the worse it gets. My memory is awful I make notes but sometimes when I go back to read them I don’t understand what I have done. Coworkers have helped but I work with budgets and grants and it gets very complicated. I have been doing this job for over 18 years. I have zero confidence in my abilities now.