How to get through this? I'm being ridiculous?

So my fianc� is in submarines, in the navy, and legit works 16 hours everyday 7 days a week. He is never home. He is tired, emotionally detached, and angry. We have been fighting a lot lately, because of stupid reasons, but the underlying problem is I miss him terribly. I miss what we had when we were together, and spent time with each other. He leaves today for two weeks, and I'm besides myself. I know this is stupid because people go through 15 month deployments all the time, but I'm still sad, only because I already never see him and when I do it's brief and distant. I've been crying all day. What can I do? Please no rude remarks! I'm already sad as it is.