Need some Insight/Support/Thoughts

So I just had my second baby(first is 4yr old boy, this is almost 3mo girl) with my son I breastfed for about 3-4mo and I’m trying to feed my daughter longer esp due to the fact I’ve taken more of a break with her due to me being sick the last few weeks. But I’m trying so hard to jump start my milk again and can’t seem to. Iv been taking the upspring milk flow with fenugreek and blessed thistle, but my main problem and the real help I need is due to my problem Iv been having since 2013. I don’t feel the need to eat, I can go days without eating and when it first happened I would force eat and throw back up. My pregnancies went okay due to the fact I smoke weed, both deliver drs knew and were okay with it and saw the help it did me(my son I gained 30lbs and my daughter I gained 40+lbs). I have times where I feel down due to my kids seeing my eating but right now my main concern is breastfeeding my daughter. As of last week Iv been feeding her when I can and throughout the night and in mornings when I can. But smith at still means she’s mainly on bottle(formula). Her weight has never went down even in hospital, she is 10w 6d and is 12lbs 21in at birth she was 6lbs 8oz 18in. Please any information will be taken into account💖