My dd was the same way and my ds acts like an attention deprived little maniac when I am totaly occupied with dd, plus I am a single mom who works full time so I have no one to help me handle either of the two, sometimes I go days (5 is the record) without even getting a shower because by the time I get dinner cooked & toddler fed, one of the kids bathed (they alternate days) dishes washed & laundry switched over/folded I am so tired that I fall asleep nursing. A nipple shield may help the bitting, you can also unlatch when she bites, she won't like that and eventually will stop biting (in theory). What kind of bottles have you tried? Experiment, experiment, experiment...One Step Ahead even makes a breast shaped bottle (the entire thing is soft and really looks like a breast). Have you considered pumping when you return to work? The Ameda Pureply Yours is a wonderful dual electric pump but it isn't nearly as expensive as Medela (although the quality is equal, I have use both). Sometimes you have to make hard decisions to keep your sanity (which is a very important thing to have). Just know that you are her mommy and you love her and that just because you don't continue to BF doesn't make you any less of a mom. She won't hold it against you and you shouldn't hold it against yourself.
Amanda Mom to James (2/25/04) and nursling Alice (8/24/05)