I'm sorry! I wish I read your thread earlier!
I'm sorry about all that happened to you! I'm sure you're going through a rough patch, and try to think about the last time he was showing some emotion. Perhaps there was a reason why he became so apathetic?
Honestly, I think you two need to go out on a nice vacation, dinner, or something! Maybe an emotional connection will be established! I don't think a human can be lacking emotions for that long. He maybe agitated about something. I'm kind of repeating myself here because I really think something could be up. Also, maybe a death in the family gives him another reason to not even bother with his emotions. He's probably closed up until he can get everything in his mind straightened out.
Has he ever seen a T? (I'm sorry if you mentioned this already..) And furthermore, how long has this been taking place?

I think for now, leave him alone and take care of yourself. Treat yourself as soon as you can! I think this is vital because if you are calm, chances are he will loosen up.

I hope you are alright. Stay strong. (((((((((((LovebirdsFlying)))))))))))

ps: I'm sure your husband is still a wonderful, non-robot.