I'm almost 35 weeks and I've been absolutely miserable during my 3rd trimester, I'm having a hard…

I'm almost 35 weeks and I've been absolutely miserable during my 3rd trimester, I'm having a hard time getting through a shift now, I work as a cashier in fast food and I'm constantly on my feet, and my body just can't take it anymore, I can't even stand at the register without feeling faint and nauseas, I had to sit down because I was about to pass out, this is the second or third time this has happened. Today they just expected me to get back up and work, even though I have been feeling like this and they are quite aware of it. I'm almost 35 weeks on top of this, I finally get off and what happens? I get yelled at for not moving fast enough, not looking happy, and not moving too much. Let alone I literally felt sick to my stomach, and faint. I've come so close to passing out a couple times. I'm infuriated and I can't wait to start looking for a new job.