I desperately need advice

My boyfriend is moving away in either less than a months or a few months (his parents haven't decided yet) to the UK. I'll be moving back to the UK after I finish school for my gap year, so we'll reunite in December. I'm just very nervous about the months that will be online and how upset I'll be without him.

I really love him more than anything, I can't bear him being so far away for that long. Our relationship is strong and I very much trust him, I'm  just nervous. I'm so nervous. I'm trying to keep a brave face, but it feels like there's a mass of concrete in my stomachs. 

This is my first healthy relationship and I intend for us to last. Any tips on maintaining long diatnce relationships?