Is it healthy to be taking so many vitamins/supplements while breastfeeding?

Hi, I was wondering if it’s okay to take many vitamins/supplements while breastfeeding? I have an eating disorder, so I don’t think I’m getting what my baby needs through my diet, as I eat 500-900 calories a day. Please don’t be rude about my ED, I know it’s not healthy.

Although my boy is 15 months old, and I know I could stop breastfeeding, that’s not what I want to do. I have prenatal vitamins, vitamin D3, iron supplements (I take this because I’m anemic), calcium, and vitamin C. Is it okay to take all of these together? Is it okay to take all while breastfeeding?