Oakmaiden, you think you're an unnatural mother, I went away for a week when my dd was 4 months!!
I had a really terrible birth culminating in a 10hr general anaesthetic, 10 litre blood transfusion and a fairly long stay in intensive care/hdu, then took a long time to feel any better. I was going back to work when she was 5 months and didn't feel able to cope with anything as I was so deep down tired. I had lots of help but couldn't stop doing it all myself anyway. So, I took a week with my husband in Grenada and my mum (who had been very involved from the beginning and knew all dd's routines etc off pat) looked after her.
I cried the whole night before, all the way to the airport, all the way round the airport and most of the flight. Made a recovery once I got off the plane and it was 30 degrees & sunshine (in January!).
I did miss her like crazy, every time I saw a baby I snivelled. Even snivelled once when I saw a buggy lol! However, I slept, lazed around, ate good food and most of the time enjoyed it. Phone bill was about £300 as I called home 4 times a day!
I can honestly say that when I got back, I felt like a different person. I enjoyed my dd so much more from that day on, I felt human again.
I know that some people thought I was a bad mother for going, but equal numbers said "good for you" and thought it was a sensible thing to do. I must say that there is no way I would have done it if my Mum hadn't been so involved and was so good with the babe, also I couldn't b/f due to drugs I was on, so that wasn't an issue. Other than that week I have not spent a night apart from dd and she is 8 month now.
Next year, we are going away again for a week on our own. I think it's important to get time to yourselves. I appreciate julen that yours is prob not a holiday, but I can assure you that once you're wherever you are going then it is actually ok (though I'm already worrying about next time lol!)
Sorry for the long rant