Suddenly refuse bottle

My two months old son suddenly refuses to take bottle of express milk. He has been both breast feed and bottle feed since 2 weeks old (mostly bottle feed). Now he doesn't take bottle. He get fussy and even upset when i try to bottle feed him. I also ask my inlaw and my husband to feed him and still doesn't work. He wants to be breast feed and im going back to work this week. I don't know what to do.