Chest pain during morning when i wake up ?

For the past one year i'm having left chest pain during morning when i'm on the bed. If i breath deeper the pain increases. But after i get down from the bed i goes off. It is only during the morning time. I'm very afraid of it. So please help me to cure this. Tell me if you know any dietary sources or any physical exercises that can cure this problem. Also tell me why this problem is created. Thank you.