What do I do???

My 10 week old son has been a super happy baby for the most part up until a few days ago. He started getting fussier a week or two ago, but he was pretty easily soothed. But starting a few days ago, he has become almost inconsolable. The only thing that calms him is a boob. He used to love his pacifier but now he won't take one. And when he latches, he just sits, he doesn't seem to actually eat. But when he's crying, he acts hungry. What should I do? Help!