"I sometimes have a queer feeling with regard to you - especially when you are near me, as now: it is as if I had a string somewhere under my left ribs, tightly and inextricably knotted to a similar string situated in the corresponding quarter of your little frame. And if that boisterous channel, and two hundred miles or so of land come broad between us, I am afraid that cord of communion will be snapt; and then I've a nervous notion I should take to bleeding inwardly.”

~Charlotte Brontë, Jane Eyre, Mr. Rochester

As good a description of missing somebody as I've ever read.