Dolfette, being in a long distance relationship myself (well mostly anyway) I can strongly identify with what you are going through. Pining does physically hurt. While I can't say that anything makes it better because for me it doesn't.Things to take your mind off of how you feel should work to an extent. Everything I do reminds me of him or something we do together so it's not that easy. Sometimes talking about him to my friends works, sometimes it makes me miss him more. I try to go out as much as possible now and just be with people who can genuinely take my mind off of him temporarily.
I find that's while nothing completely works because he is always in my heart and mind talking to him seems to ease the pain.
I am sorry you are going through this but when you see him again it will make the connection between the two of you that much stronger. It does for Craiggers and I.
*hugs to you dear I genuinely feel your pain* my pm box is always open to you should you need it.