Work. LONG POST!

I need some advice. I’m 33 weeks and I work at a zoo as a supervisor for the retail department. I have a doctors note stating I have to take breaks every hour, I need to park closer etc. so my doctor and husband said I need to do what my note says to see if I can continue to work as long as possible or if I need to go ahead and stop. I’m literally miserable. Everyday gets harder and harder. My hands are swelling from doing things at work, my feet are as well. I can’t stand for long periods of time when I’m needed to. I don’t know exactly how to tell my doctor that I can’t work any longer without coming off as a whiner. I go to her this Thursday. Does anyone have any advice?