Working while pregnant

I’m 5 months pregnant & I work in a 24 hour busy pharmacy. Our pharmacy never stops, especially with covid vaccines it is extremely busy. My body is tired and everyone around me is inconsiderate. I have hyperemesis gravidum so I’m often hit by waves of nausea which slows down my productivity. I also carry bigger than most girls, I’m 5 months pregnant but look 8 months. My legs and feet hurt so bad & I have to do a lot of bending which also doesn’t help. My doctor wrote a note for frequent bathroom breaks & sitting but it doesn’t help when we’re extremely busy and there’s never enough people. I never get to sit because there is always someone there & I am always needed. Any suggestions? I’m on the edge of just quitting but I’m trying to hold on.