Please don't be so hard on yourself! I know exactly how you feel, I'm a nurse & have been off sick with stress & anxiety attacks about medication administration! I was checking things so many times & would wake up in the middle of the night panicking!! You have to be kind to yourself, could you talk to a more senior pharmacist? Do you do anything outside of work? Start by writing down 1 thing you are good at eg "I am good at listening/ cooking..." Also do 1 thing a week that you enjoy, maybe something you've stopped doing because you've been worrying about work? Then book enjoyable things in advance eg a play or a short course on something new. Please try & do these 1 small step at a time & they will help! & talk to someone, you are not on your own!!