Seek some breastfeeding support. There are peer groups (often run through children’s centres) that will not only support you with position and latching but also connect you with others. Or there are private IBCLCs who can help either online or in person. Or there is the national breastfeeding helpline which is 24/7. Good luck
My daughter was really poorly so wasn't eating much which effected my supply and I was experiencing the same issues as you. One of the community nurses that was supporting us at home after we left hospital recommended I take fenugreek supplement. May be coincidence but my supply is definitely coming back
If you have the money buy a breast pump and pump between feeds, even if you barely get any out your nipples are being stimulated which tells the body to produce more milk. After a few days - 1 week your supply should go back up. Just make sure you’re drinking lots of water and eating well 💗 I’m sorry for your situation🥺
It could be she is just going through a growth spurt and needs more milk. You will produce as much as she needs don’t worry as long as you follow her cues. It could be also your period coming. I recall having a sink in my supply during and just before my period came
Hang in there and be kind to yourself! Sounds like you have a lot on your plate xx