I don't see why you can't legally separate from your husband if you want to. As far as getting alimony, I think that will be up to the judge. However, since your marriage has been pretty short, it may be more difficult for you to get alimony. Generally speaking, I think one spouse has to be economically dependent on the other for a significant period of time in order to get alimony. But, I'm not an an expert so I'm not positive on that.
Here's an article that might be helpful:
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You might also consider contacting an attorney to represent you in the divorce. An attorney will be able to answer all your questions and help you throughout the divorce proceedings.