It does sound a bit like a blocked duct. Do you have a white spot on your nipple? I had similar symptoms when DS was weaning. The LC I spoke to asked that question. I did have one. So I was told to try to squeeze the spot out (like squeezing a pimple). Very painful but it worked. When I was sueezing it, I could see the white spot coming out just like a pimple. Once it was out, the milk started spraying. Best feeling ever lol! You might have to feed or express a little to get some relief. Basically there are many ducts in the breast & even if one is blocked, the rest will still flow. The blocked one will continue to produce milk but with no release, it becomes hard & sore to touch. HTH