Help! It's storming here and I'm home alone, and terrified!?

My mom's still at work, and she is getting of in about fifteen minutes but I'm still scared. It's not raining super hard, not much lightning, and not much wind but the thunder is very scary! I have a fear of stuff like this, so I don't know what to do! PLease help, tell me any advice or ways to calm down! :'( It's scary here.