I have severe anxiety and working at a fast food restaurant is absolute hell. When I first started I would have to go into the back frequently, panic, and then go back to work. I'm taking my meds regularly now, but there's still panic. The people I work with are great though. They let me take breaks and talk me through my panic. My advice would be to find those coworkers, tell them about what's going on, and let them help. Medication aside, I know things would still be bad I didn't have that support system.
I wish you the best of luck!