Missing someone can be rough, but then when you get to see them or talk to them again, it's all worth it. And the thing that helps you get through it is knowing that phone call is going to come and you'll get to hear their voice even if you can't see them. The best advice I can give you is to look at the reasons why you miss them, their voice, their personality, their smile, whatever it is, and you keep those in mind. It may be be bittersweet, but I bet you a dollar that you'll smile.