Have him come to see you? Even if you have to work while he's there, it's better than nothing surely! I've been in a LDR since Februrary and everything is still going great! We've managed to see each other lots, the longest we've gone without seeing each other is just under 2 weeks. Things will be difficult when we both have loads of work to do next year, but I'm sure we'll manage, we have a rule: never leave it more than 2 weeks between seeing each other, and i fully intend on sticking to that, even if we do have to do loads of work when we're together.
Inbetween seeing each other, just keep up the contact, phone etc...it's hard work, but as long as the trust is there and you work at it, you should be fine!