Nursing strike


I wonder if anyone is going through the same thing/has gone through the same thing and has any advice. My son is 8.5 months and breastfed. Up until now everything went so smoothly but he's been on a nursing strike since Wednesday. I've contacted a lactation consultant and followed all her tips and still nothing. He gets so angry when he even sees my breast. It's so frustrating and I'm so upset about it. I'm now pumping full time. Anyone going through this?