Now granted we were not married at the time, but my future husband lived across the country from me when we were first dating. I would make long emails with pictures and cute sicking crap like that and send to him. I'd daydream about him.
I was also busy with work which did help me - is there something constructive you can get involved with? Are there any other moms around you that you can hang around with and talk? Any other outlets for your free time - reading, or painting, etc.
You are going to still miss him, but maybe you could come up with something you can do for him - to surprise him when he comes home.