I had to stop bfing with ds1 after a few weeks because of awful pain which every bfing counsellor I saw couldn't help with. This time with ds2 someone mentioned reynauds phenomenon which is blanching of the extremities usually the hands but it can also affects the nipples. Mine go white at the ends or purple, the pain lasts for ages after feeding and they sting like crazy in the cold. My mum also gets it in her hands. I've now just finished a 2 week course of a calcium channel blocker and it is so much better so if anyone is struggling desperately and it's not poor latch, tongue tie, thrush etc ask health visitor about reynauds.