Last night I noticed that my breast felt quite tender and hard like it was engorged but only in one area (outer middle part of breast). It feels like a big hard thickening and I tried massaging it while DS fed on it but it didn't help, then i tried expressing and couldn't get anything off and then I tried hand expressing and pushing towards the nipple and lots of milk keeps squirting out. I've been doing this now for about 2 hours but the hard lump is still there although maybe a little less hard. Does this sound like a blocked duct and how long do they take to go away? I'm worried