Not eating/seperation

I’m 13 weeks pregnant and me and my husband just separated. I barely want to or can eat anymore. Nothing is appetizing to me and when I eat when I don’t feel like it I get very sick and nausea. Although I am so hungry and my stomach feels like it’s burning Becuase I’m so hungry. I don’t know what to do. I think it’s Becuase I’m so so sad so I don’t feel like eating but I know it’s not good for me Becuase the hunger pains, me needing to feed the baby, and me feeling like I’m going to pass out sometimes. I pretty much have to force my self to eat and when I do it’s barely anything or I get sick from eating it because I don’t want to eat it to begin with. What can I do?? .