Bottle Refusal

I know I’ve posted this before, but I’m seriously having an emotional/ mental breakdown. I have to go back to work on Monday and my baby is still refusing a bottle. All I wanted to do was to breastfeed my baby. We had a lot of trouble at the beginning getting her to latch. My husband and I took birthing and lactation classes before she was born and they kept stressing to not give the baby a bottle or pacifier until 4 weeks or once breastfeeding had been established...well everyone left out the part that if you don’t introduce a bottle between 6-12 weeks they may never take it. I was unbelievably happy when she finally had a good latch and she has been gaining so well. It’s all I ever wanted. And now I feel like I have failed majorly by not giving her a bottle sooner. We have tried a few different bottles and nipples that mimic my breast and all she does is scream and gag. I know the nipples aren’t too long because she gags before it’s even all the way in her mouth. What will I do if she doesn’t ever take it?! I have no choice but to return to work. Please help 😭