Majorly struggling...

So let me start off by saying I have really bad anxiety. I have been married for nearly 2 years my SO and I have been together for 4 years. Tonight is the first night he has spent away from me within the last 4 years. I'm having really bad anxiety because he's not here. I know I can't expect him to be around me all the time but I'm really really struggling. His phone has died and has no way of contacting me. Very very stressed.Just looking for advice on how to calm down befor I go into complete shutdown panick mode.