Lo refusing milk n solids

His ladies

My 9 month old son is refusing solids n formula for 2-3 days now. He used to eat 3 meals of solid a day (pureed) and is suddenly refusing. He used to eat well, n now it's a struggle to force 2-3 spoons in him. He's also refusing formula. I do try to give him a few oz every few hours. Any idea why this is happening? Anybody else's lo in the same situation? I'm really worried n frustrated. The only thing he has is my breastmilk, unfortunately I don't have much breastmilk anymore.