Help me please

I had a miscarriage and my body became really depressed and I would eat less and less and now I’m at the point to where when I eat I get so nauseous which was one of the reasons I stopped eating because I don’t like feeling nauseous it gives me anxiety. And my boyfriend is so scared he is going to lose me if I don’t eat. I need to start eating. I just don’t know how I’m going to get through this. It’s really rough but I want to do this for him I really love him and we are trying to have a baby. I was 110 pounds in may and now I am 82.2 pounds.