The bottle blues

Help! Xander is refusing to take a bottle from anyone. I went in to work a full day of work (finally) and had to come home on my lunch break to nurse him. When I arrived he was one angry 5 month old. I love nursing him but can't stand that he won't take a bottle. It worries me that he is being so rough on his caregiver by crying. It breaks my heart to hear him crying. And it wears me out that he relies on me so much. Any suggestions?