Sore boobs

Te

I have been waking up every morning for the last month or so and my boobs have been feeling sore and full as if i need to pump or nurse. I took a pregnancy test today and it was negative and i also had a period last month. I have been moody and exhausted but im not sure what it could be. Has this ever happened to anyone else? Im so confused because my youngest is 3 and i stopped nursing at 6 months because of supply