It sounds to me like he got used to having you around, and although he is excited you are working, he didn't know it was going to be like this. Men are not like us we verbalize are feelings, they act like kids when they don't get what they want lol. Pouting and throwing fits. All I can say is try to make the most of your together time so that he can feel secure. He loves you that's why he misses you and doesn't know how to communicate it.