I think the worst thing was dealing with things when DH was away at sea, or on exercise, and then he criticised what I'd done when he got back.
I gave up my job 18 months ago and moved abroad with DH as he had a second posting abroad, and we had spent 2.5 years only seeing each other every six weeks. We talked every day, and he always rang me to wake me up in the mornings. We also spoke in the evening, and e-mailed lots as as well.
I ensured that I built in little treats for DS and I - a film maybe, or a meal out, and if I could swing it, I'd get my Mum to have DS for a night so that I could have a drink and a long hot bath without any hassles.
DH seemed to have an expectation that I would stop being the coping type and morph into the little woman when he came home, but he's thought that for 23 years, and now understands that I'm me all the time. I think that it can difficult for the one who is away to come back to what may seem like someone else's space and try to fit in again. We found this...when DH came home it was like he was in my space...when DS and I came over to Brussels for visits to DH and stayed in his flat, it was very much HIS space, and I felt I had to behave like a visitor. Now we are in Married Quarters and it is much better as it is OUR space.
Being apart sucks, and is not easy with children, but it does get better and more manageable as it goes on, and you develop strategies to deal with it. Sometimes, when DH had a posting that meant he could live at home, I used to wish that we were weekending again, as he was being irritating!
I felt sorry for him though as he missed a lot of DS getting older, and doesn't have such a close relationship with him as I do. Hence the move abroad to try to correct that.