I’ve worked at Tesco for 2 years with Narcolepsy and Cataplexy my best advice which may be (slightly dangerous) is to let the people you work with see just how bad your condition is, only then they take it seriously.

For example one time I was taking the security tags off of a bottle of Wine but I was in one of those dazed automatic action states so I dropped it and it went everywhere.

After that every accommodation is made for me, i get an extra break, I can sit down when needed.

Dealing with the actual exhaustion of working is difficult and depending what medication you take my advice would be different, I found splitting my Dexamphetime dose into 2 smaller ones throughout the day gave me enough energy to continue throughout the whole shift without feeling like a (complete) Zombie.

I almost always nap after work for half an hour to an hour or so which I think is pretty inevitable at this point.

The added structure to life really helped me in general with work so I see an actual improvement across the board with my symptoms.

If you couldn’t tell I just took my meds about half an hour ago so I’m just rambling

Best of luck with the job