Erica, sorry you've had another rough day....hang in there, and maybe magic mom can spell you again soon
It probably is just a blip and for whatever reason he's not wanting to eat much. If he's not running a fever, I"d just hang in there, but if he's not eating again the next day, you might want to call the dr - or just ask when you go in for the shots. And yep, the not eating will mess up the sleeping for sure, as will the shots in all liklihood, just do the best you can.
Barb - If you have concerns about bfing, please do post on the bf board, I've gotten GREAT advice there in the past, so they can probably help out. Are you doing single side feedings or double? If she's doing 10 min on each side, she may indeed be getting enough to eat. But I would still post over on that board. The danger you can run in to with too frequent feeds is that it can lead to snacking, and that will definitely mess up naps.
In terms of an earlier bedtime....you could try feeding at 6:30 (I think you said that's when you need to start Abby's day for work), 9:30, 12:30, 3, 5, 6:30 to bed with a df at 9:30/10. The nursing her to sleep is something I would be careful about. But that's your call, she will definitely get used to that and expect it. I nurse my dd at bedtime, and even if she falls asleep while nursing, I still take her off, put her in her sleep sack, and go through her regular bedtime routine, rather than just slipping her into bed while still sleeping. You may want to try that, up to you.
Hang in there ladies!!