I had mild pain whilst taking a deep breath or coughing on my right side of my chest at the top which would come and go and then when i woke up it was really bad and now it's not really there ?

Chest wall: Chest wall muscular strain may be the cause of the pain while breathing or coughing. During the respiratory cycle the chest wall muscles are active and if there is pain, there may be muscular strain. Other causes include inflammation of the lining of the lung. Monitor for fever, shortness of breath, and use Motrin and local heating pad for pain relief. Please follow up.