I have the same feelings regarding feeling alone....even when I am amongst friends, I am in a rush to go elsewhere (it's like a wave hits me)...difficult to explain.
All this takes time....like when a loved one passes away. The difference is that the loved one is still lingering around (because of the kids etc.) and it takes time to detach totally. Perhaps it is not really loneliness we are feeling but simply that we miss the other person or rather we are so used to "being" with our spouse. Old habits are hard to break I guess.

By the way Woog...rhumour has it that you may make your way to my neck of the woods. I would take it as a personal insult if you do not look me up.