33 Weeks

I'm 33 wks and I feel like I'm going to pass out all the time. I constantly have to go lay down. Very lightheaded extremely nauseous. I have GD so my sugar is ok I check it 5 times a day. This is one of the worse feelings. I always feel like I'm bothering the nurses at my doctors office, but when I feel like this constantly it can't be good? And advice ?!