It might be you have blocked ducts but as long as it's not painful I wouldn't do anything just yet. When people wean they do sometimes go through phases of being a bit lumpy or engorged.
As for why there was a sudden change yesterday perhaps something is going on in your menstrual cycle which is causing some changes. Or could your breasts have had some stimulation (from DH
, a power shower, a sleeping position) - that might have been enough to set off a little bit more production.
It's normal for milk to still be there for quite some time yet (and occasionally leak). For some people it can take weeks and months for milk to go entirely.
For now try some cool compresses (like wet cold washcloths) for relief.
However if the lumps do continue to feel uncomfortable and move into feeling painful I would worry about blocked ducts and I would try and 'clear them' with some warm compresses and massage (massaging towards the nipple) and perhaps a little bit of hand expression or even pumping (the absolute minimum after warm compresses and massage). I know it might seem like going backwards to pump at this point and stimulate your supply but it's worth a few more days of pumping and scaling it back down again to avoid mastitis.
Check out the FAQ on mastitis and blocked ducts.
Hope you are all sorted soon. It really might be completely 'normal' but just be aware of what blocked ducts might feel/look like.
