Awwe hugs!
I can hear the desperation in your voice. I want to give you the biggest hug. And tell you how awesome you are for trying do hard, for doing all the expressing and painful feeds your doing an awesome job!!!!!

Breastfeeding takes time for both mum and bubby to learn, it's not easy.

Did the LC teach you an bub to attach (Even with a bit of tongue tie sometimes it's just a bit of the tehnique) having the babies chin pushed into the boob helps with attachment. By pushing bubby onto your boob with one hand rather then puttin your boob down to the baby. Making sure bubby's mouth is wide open and the tip of the nipple is getting Down to the back of the mouth. These are all little things that might help.

Breastfeeding is hard work for bubba, that's why you might be finding she can skull a bottle quick, it takes next to no effort. but the breast she has to
Really milk to get some.

I hope you are able to fulfil your breastfeeding journey for as long as you want Xoxox. Take care.
Love MN ;-)