What to do if you have really really bad back pain at work that requires standing for 9 hours?

Anonymous
I'm in college so I work part time. For my part time job I work as a cashier and I work Saturday and Sunday's for 9 hours each day but the thing is my back hurts a lot like a lot lot out of 10 it hurts 11/10. It hurts to the point I can't even move or do anyfninf and it feels like I'm getting stabbed and j just wanna go die. The thing is because of the pain I sometimes lean on the counter when there's no customers because that helps a bit but then my supervisor sees that and she complains and tells me not to do it and if I do it again i could get fired and stuff. So I try not to do it but it honestly kills. What should I do? I'm not overweight by the way I do go to the gym like everyday. The back pain only occurs when standing for a long time (at work). I don't know what to do :( should I just keep taking both aleve and tylnoel everyday? (Both at the same time)
What to do if you have really really bad back pain at work that requires standing for 9 hours?
3 Opinion