Wow, thanks for all the replies everyone. Some inspiring, some altogether more worrying!
There's no doubt it will be hard. We've been through tough times before, had huge raging rows, but still managed to come out of them to tell the tale (and that was when I was working in a regular 9-5 in Sainsbury's). I guess the good thing, (although some may beg to differ) is that we knew each other before I started flying professionally. I am determined to make it work, but I would imagine almost every person who has ever married has expressed similar sentiments at the time.
Anyway, keep the information and experiences coming. They're all very useful. I fly shorthaul by the way, which means in my company being away from base on average 8 nights a month.
Thanks again!