Amxious for no reason?

My boyfriend left at 2 am this morning for Utah. He does concrete for a living and they need him to drive a new mixer truck back to Michigan from there. It's an awesome opportunity for him and I'm very happy for him. However, I have really bad anxiety and I have not spent a single night away from him in close to three years. I have no idea what to do. I'm so worried and anxious that I can't eat, sleep, barely function. I didn't think it would be like this, and he's been calling and texting while he can which helps a little. He should be back between Friday and Sunday depending on how things go. it's the first day he's gone and it absolutely sucks. Will this ever get better? Has anybody else experienced this? he's supposed to leave again in a month for a workers fishing trip in florida.