How can I cope with a husband that is emotionally unavailable?

Communication. It may be one way for a while but try to experess your emotions to your husband and then try to interest yourself in the things he likes and is interested in. Show your interest overwhelmingly in him and his likes and desires and then gently begin to try to engage him in what you like and your needs. You may need professional help. You may need to know more of the "why" that he is "not there".