Irrational fear of him dying??

So a guy friend of mine who I think is starting to become more than just a friend went up to Maryland for a competition. He's driving and it's a pretty long drive (3-4 hours) but I feel like he should be home by now. He hasn't answered any of my texts since 9:00 am and it's now 9:00 pm and I'm worried something could have happened to him. Obviously he's probably fine and they just had reason to stay up there longer or maybe overnight but I can't stop worrying. Do any of you ever get these irrational fears? How do you overcome them?