|Yes, Mom made our dresses!|
The loss of someone who understands you intuitively, a person who shares the same roots, experiences, memories, and to a large extent, world view, is a shock. Who can I talk to about this or that? Who can I call when I need to hear a familiar voice? Who already knows I'm a little weird and therefore won't judge me when I make my latest confession or launch yet another rant?
There isn't a perfect answer, but the best one is the friends I mentioned in the first sentence. They don't know me as well as my sister did, but they know what it's like to share a lifetime with someone and then lose her. We talk. They listen. I listen. We'll get through it.