Helen, I'm feeling exactly what you are at this point. On top of the bobbing off and on and 5 min feeds, I'm off dairy and wheat/gluten to help with his digestion. So, yes, I'm selfish because I'm dying to eat bread and cheese and ice-cream again! Anyway, I'm still thinking that around 6/7 months when he's on solids, I'll transition to FF or at least cut it back to only 2 feeds (morning and bedtime) and the rest formula.
During this horrible sleep regression/routine change thing this past month, I also got plugged ducts a few times because I didn't wake him for the DF. I just kept thinking "why am I doing this?" Anyway, I battle back and forth between quitting and sticking it out for the year like I did with DD.
Don't you go back to work soon? How will you handle the BFing and work?