It can be hard that he will be away, but if you occupy yourself for the next two weeks it will be ok. Just think about how good it will be when he comes back and can tell you about the great holiday that he has had.
I am glad that you said you want him to go, as it shows your heart is in the right place. Just hold on and be patient for him to go and have his holiday. He will come back soon and when you reunite, you will have missed each other and will have loads to tell each other, so it could even be a refresher for your relationship.
To stop feeling sad - listen to upbeat music and don't watch any sad films. If you watch TV etc. go for positive things, such as comedy, rather then things that will make you think of your boyfriend.
Fill up your week - go and see friends, find other things to do, maybe go spend time with family etc. If you work, why not take more hours (as long as you enjoy the work)?
The best thing to do that I have found is going and spending time with active, outgoing and upbeat people, as they can take my mind off things, rather then spending time with friends who would focus my attention and conversation on the boyfriend.