I think what you're feeling is natural. Is there anything you like to do that he's not into? My mom is similar and hates it when my father travels. I always suggest that she treat it like a chance to just indulge herself in what she likes--to get some Chinese takeout, watch her kind of movies, hang out with friends, etc. Maybe you can turn it into a positive thing. Alternatively, maybe you can channel your anxiety into something--learn how to cook something he likes or similarly prepare some kind of surprise for him, when he's back? Or pick a hobby you've wanted to develop or have neglected and spend your free time working on it?