CalmingOcean, I'm with you and I'd agree with jelly-bean that you need to ask for help. For the benefit of your baby and you. If you don't agree with olanzapine being prescribed to you discuss that with your psychiatrist and tell him your relationship with food that your son is eating.
I have two kids, 5 and 1.5 yrs old, and I think my elder is now also a picky eater and very nervous and sensitive thanks to my ED (it's atypical bulimia, I used to work out excessively, no vomiting, right now I have depression so even if I want to exercise I just am powerless to do that I feel so tired and depressed all the time so I don't do it and then the ED-guilt just overwhelms me). It's hard for me to get myself together and it's even more harder to take proper care of them. Sometimes I think they deserve a better mom..
Take care!