SO leaving this afternoon :(

My SO and I have been in a long distance relationship for quite some time now and finally he's moving in with me starting in January! For the time being he came for a couple weeks to help out since I was battling with major nausea, which was interfering with my daily activities. Any who, he's leaving back to Norway and I  will be seeing him in 3 weeks time, but I'm just nervous of being by myself again, and dealing with any sickness I still have left and missing him like crazy. He's my best friend and my rock and just knows how to make me happy, I hate leaving his side. I know it sounds silly that it will only be 3 weeks but last time we were apart (which was only for a month) it was really hard for me. I don't have a lot of friends in the city anymore so I know I will feel lonely once again when he leaves today. I'm just venting, and wanted someone to hear. Thank you ladies :).