Hi there
I've never gotten a job like that which would induce anxiety, but I can completely imagine how stressful that must be as I have social anxiety. I would say give it another 3-7 days and if it hasn't gotten any easier, quit. It's not worth the money if it's causing you so much distress, and you should always put your mental health first. Maybe there're other jobs you could do which are less fast-paced and more enjoyable for you?