It does sound like a rut me and OH had this problem a few months back. Always fighting, not really connecting. We know have date night at least once a month, just us and no kids, we had a massive talk about what was bothering us and why we felt it was happening and what we felt we could do to change. All this has really helped, and even just the little things like coming home from work with a chocolate bar for me made it better.
To be honest I believe bickering is a good sign, I think it's when the fighting stops you have to worry. Bickering means there's still passion, you're still fighting for it. Not fighting anymore and just giving in to each other is like giving up. I mean I'm not saying you have to argue for it to be a good marriage, but if you can't be bothered to fight anymore it means something.
If you're still crazy in love with each other I'd fight for it. But then again you need to do what's best for you. But I agree that maybe you should try and get away for the weekend, just the two of you x