My experience has been similar to what Open Eyes describes. My husband gets it and is supportive, but I find that most people don't what to know and a few people are openly hostile--as in, oh quit whining. From what I understand, that's what soldiers used to get too--the 'quit whining' thing.
I think it's just very threatening to most people. It makes them feel uncomfortable and vulnerable. They don't know what they're supposed to say, and they feel like now they know something about you that's too intimate, too disturbing--something they wish they didn't know.
But there's another dimension to it for me, one it took me awhile to appreciate. I came to understand over time that going into it with others didn't usually get me the support I wanted--it just put in me in the position of having to absorb THEIR extreme reactions and THEIR process, something I didn't necessarily want to do.
So I rarely talk about it now. I'm careful about who I disclose this to.
Good luck and all the best to you!