Supa, I had that occasionally, pretty rare though (the last one was last week) If W sucks long enough (he is usually a quick feeder) then I can feel something like the contraction pains in the early months. But see how you feel over the next few days, if you still experience that continuously you might want to ask someone?

Fianne, sounds like blocked milk duct to me? Try to feed Max on that breast more often and position her chin on the lumpy area. A gentle massage towards the nipple while feeding can also help (also massage while you're taking a hot shower). Oh, you might want to use hot compress before feeding. This is just based on my experience, perhaps someone else here can give better advice than me ...
Hope the lump goes away soon and doesnt turn to anything worse.
If its still painful, you may want to call ABA or post something in the BF section?

Sorry havent had the chance to read the previous posts. Hope everyone is getting a good sleep tonight