Yeah, I know those sharp, shooting pain. Actually I too wasnt sure if we really had thrush as I had very sore and cracked nipples. In my case, the pain went away after a while into latching but returned after baby detached from the breast. I had that during the early months of breastfeeding.
Both Quan and myself were being treated for thrush for almost 4-6 weeks (or was it longer??). The peade gave Quan oral gel and myself fungal cream. I tried to air my nipples whenever possible and used lasinoh cream in between the treatment with fungal cream.