Baby isn't Eating.....

Hey Friends, my normally happy baby is all of a sudden refusing to eat from either breast or bottle. Normally by this time of day, 11 am he has eating for about an hour. Today he as eaten for a grand total of 10 minutes.

He latches onto the boob, but after two sucks comes off wailing. I tried feeding him some of my stashed breast milk in a bottle, which he normally takes to like a champ, but he refused that too.

Is this normal? I'm a FTM so I'm worried about everything.