Possible eating disorder postpartum

I’m 3 weeks pp, and I’m just such a mess. I had anxiety snd depression while pregnant and was put on antidepressants which helped a little. Anyway I thought because I was already on antidepressants that would help with postpartum depression. I was wrong, once baby came I had terrible ppd/ppa to the point where I would scream and have crying fits randomly. I pretty soon developed an eating disorder, I’m just not eating enough. It’s like a weird mental block when I eat, because I gained 70 lbs and I hate how I look. I feel like I’m constantly overeating even though I’m not. So I’m basically eating like 1200 cals or less and I’m trying to breastfeed which is tough because my supply is suffering because of this. I’ve lost 34 lbs since I had my daughter June 1. Mind you I was 250 so it pretty much fell off while pumping, but I know I’m not eating enough and it’s like my body refuses. I’m just not hungry and don’t want any food. I have an appointment to see someone next week but I just want to know what I should be doing, I know I need to eat more so I can up my supply to breastfeed right now I’m having to supplement with formula for overnight feeds, so what’s wrong with me why can’t I put my daughters needs over my own desire to look better 😞