neglected at work

So the past few days at work, I have been told I am not allowed to eat. I am 26 weeks pregnant. There was a point when I was shaking from not eating and asked if I could have a few fries to hold me down(I work in a restaurant). I was told no. The day before, I brought a hot pocket to work and was eating before my shift and was told by the GM that I'm not allowed to bring food in to eat.. is this allowed? He knows I'm pregnant. And I was FURIOUS when he said I wasn't allowed to eat.