formulas issues

Ok so I've been breastfeeding my baby for the last 6wks. I've had to stop due to her health reasons, she has a dairy allergy. so she has been in my boob for 6wks with very few bottles. now I get wic and I had to a special formula and I found one before I could cash the vouchers. for this month .so I've been mixing the formulas bc she has had so many issues. I started it last night but it is so slow she is just not used to it. I feel like I'm starving her. I also lost my pump due to choosing to put her on formula so I can't pump anymore either. I'm not sure if I can get another one. money is super tight I'm not going back to work right away bc i refuse to put 3 kids in daycare. so I don't know what to do