SO lost! Help?!

My baby is 5 weeks. I wanted to EBF but within the first few days, my milk still hadn’t came in and she was really hungry even with me feeding her for 20-30 minutes at a time every 1-2 hours (plus the cluster feedings!) So we decided to supplement formula. She still takes the boob as soon as she wakes up or as soon as she’s hungry and after she feeds from me she takes a bottle. Until the past 3-4 days, she’s had no problem with either but now she won’t take a bottle and any formula she does eat she spits right back up, all of it. It’s not because she’s over eating because she barely has drank any formula in the past few days. I’ve tried pumping and I get nothing. One boob won’t produce anything and the other doesn’t get an ounce out. My doctor told me that just because I pump and get nothing doesn’t mean the baby doesn’t get anything because she heard the baby swallowing while I was feeding her. My question is.... how can I get more milk? I’ve tried eating certain foods and drinking certain drinks. But everytime I pump.....nothing. It’s so frustrating. I don’t want to give up because now she won’t take a bottle, but I would like to have extra milk just Incase we’re out one day and I can’t feed her except from a bottle. Can anyone help me please?? 😔