Anyone working pregnant?

I work at a super market and on my feet for 8 hours and wearing a mask. I find myself beyond exhausted like the very last couple of hours of my shift completely drained to where co-worker on top of co-worker can see it in my face and ask if I am ok? Every 2 seconds if I had it my way I would just collapse from such exhaustion! Like my bags under my eyes were on top another layer of bags I never seen before. Yes I drink water yes I eat, yes I do something sweet no its not blood sugar drop. Just chronic fatigue anyone know of any way to relieve it during work? I also feel super swollen like my limbs everything after 8 hours of working. My fear is high blood pressure will be next with my first son I almost got that because my body did not favor working at all but normal pregnancies with my last 2 for I didn't work so I am nervous that might happen this time not to mention it's getting hotter and in fear of heat exhaustion with chronic fatigue