you are doing awesome babe! but i hear ya on the sore boobs!
DD2 has posterior tongue tie and oh dear what an interesting suck she used to have lol, so i feel for you with the guzzling, tired feeds.

have you thought about seeing an osteopath? we have had 2 sessions so far and the difference for us has been remarkable. her palate was all out of whack and she wasnt really able to keep a good attachment as she was not able to latch on well with her tongue. within the first session we were able to see improvement and now, 2 weeks later we are back on track and DD is able to curl her tongue, poke it out and we good attachment and deep feeds! (of course now i have heaps more milk to deal with but i am sure that it will settle down soon enough ).