Thanks again for the responses, everyone. It's really helpful to get encouragement and to hear your specific advice and experiences. We've tried 2 weeks of oral diflucan (both me and the LO), and while it cleared up her diaper rash (which looked like yeast) and improved some of my enduring digesting symptom that had persisted since the antibiotics during labor, the nipple pain is no better. But it might be pump trauma, since my LO was not gaining enough weight, and I had to pump after every feeding for a week to get her weight up. I'm now still pumping twice per day, and hoping to get her to drink more efficiently so that I can drop the pumping (unless I'm trying to prepare something to go out). Now the doc has me supplementing the topical Nystatin cream that I've been using with clotrimazole to see if that makes any difference. I also tried grapefruit seed extract in water as recommended by one of my midwives who had the same issue with her first son, but so far that hasn't made any difference.
I've had a bunch of plugged ducts this last week (maybe as a result of taking herbs to boost my supply in the hopes that that will make the milk flow faster and my LO nurse more efficiently at the breast?). I hadn't had those before, so I'm not sure if that could be related to the extra pumping somehow. I woke up this morning with incredibly painful engorged breasts (for some reason, the LO hasn't really been feeding much at night for the last 3 days) which I've never had before, and despite applying heat before pumping/feedings, taking Advil, and massaging the areas before/during feeding/pumping, it's still painful. If it doesn't, I'll give the lactation doc another call.
Thanks Cl mama for sharing your story. I've been wondering if the failure to respond to yeast treatments could mean that it is some other type of infection. If the further yeast medications don't have any effect, I am definitely going to raise this possibility with the doc. It sounds like once we can actually determine exactly what it is, it is likely that it could clear up quite quickly with the right treatment.
I'm hoping to post again soon that I've finally found a resolution... Keep your fingers crossed for me! :)