Help me!!!

My boyfriend and I have been together for a year and a half, and every night we sleep together. We have never been apart for a day or a night since day one. He left with his father and a few of his friends for their annual fishing trip on Friday. Now...  My problem is that I can NOT sleep at all.. And I'm a nervous wreck. Not because I think he's doing something he shouldn't be doing... Its because I just feel empty and so alone that I can't fall asleep without him laying next to me. Has anyone else experienced this? Do you think that is some sort of attachment problem?