Hi again Gina
Like Dribbleface with DS1 I wanted to give up at 10 weeks (exhausted, nipple thrush, couple of bouts of mastitis/blocked ducts - plus the general concerns about 'am I doing it right'?) I read loads on kellymom and MN, and also googled a US BFing specialist (I think he was called Dr Jack Newman) who posted videos of latches etc. Also went to BFing groups, which I found demoralising as everyone else seemed to be enjoying it.
I hung onto the fact that DS was gaining weight, wetting nappies (half a dozena day, or thereabouts), pooing 2 times a day (although this is less an indicator - MWs say normal is anything between 3 times a day and once a week). My DS also had green, spinachy looking poos at about the 2mth mark - I read that this was something to do with the development of the gut, so ignored it. A week or so later, he did yellow ones again.
Re. the latch - I don't think DS1's was brilliant, but Jack Newman's website said that most babies in the 3+ month stage are strong enough to get enough nutrition from milk even if their latch ain't perfect - and as long as your nipples can bear it, so what if their technique isn't textbook?
I got to one evening where the formula was all made up and in a bottle, my mum and DH were supportive whatever I decided - and I burst into tears and took myself off to do another breastfeed. For me, I just didn't want to use formula. I believed it wasn't as good as breastmilk. Now I'm out of the woods I would never judge anyone's decision to use formula - but at the time, in that fog of hormonal tears and fears that's how I felt. (Although if you are considering mixed feeding, you might want to look at this blog www.thealphaparent.com and search for 'virgin gut' - it might make you want to continue exclusive BFing for another month at least).
WRT your baby - how much does she weigh? If she's about 10lbs I would imagine she'd be feeding about 7-8 times over 24 hours, with 3-4 hours between feeds? Are you feeding from both breasts? Do you offer 'the third side' (ie go back to the first breast - this is a good way of stimulating milk production and might allay your concerns that she is emptying the breast and getting the hindmilk etc.) FWIW, when I was concerned about all that business, one website I accessed suggested that the foremilk/hindmilk debate was far from concluded - at 10wks I would have expected DSs to feed for about 15-20mns per breast, then swap and swap back/offer '3rd side' if need be.
If you're at breaking point, can something else break? e.g. can you let the housework slide / eat more packet food for a week / get your 12 year old to supervise the 5 y.o.'s bath and bedtime stories (whilst you're in the baby's room listening out?)
From my experience, around the 12-14 week mark you definitely see an improvement - the baby feeds more quickly, your milk is strongly established etc. Also, by that stage you're 2-3 months from introducing solids, and it all seems more achievable.
I do hope this helps. At the end of the day, you're doing bloody brilliantly - if you do decide to do mixed feeding it shouldn't affect your supply too much (if you keep it to one feed per 24 hours) and you shouldn't beat yourself up about it too much. I don't think I could manage 3 kids and BF 'em all (and retain my sanity!)
Let us know how you get on.