Wow Christine, you must be really fertile!
Good luck on trying to wean your daughter b4 your new baby, i know that it can be a real struggle sometimes! You have plenty of time left to wean her, but just in case that you can't b4 the baby arrives have comfort in knowing that i know people that have successfully tandom nursed without jealousy. Your 12mo old may wean and then see the baby nursing and may want to start breastfeeding again. Mine did! He didn't do it for very long though, thank goodness!
Hope that your soreness gets better soon, that must be horrible, expecially since your daughter has been biting. Bailey bit and it was HORRIBLE! Have you checked to make sure that it is not a yeast infection just to be on the safe side? Just a suggestion. Have a great day, see ya on the bf boards!