Past 3 mornings i've been having gerd gastritis pain and burping for a few hours after i wake up. seems ok at night. what cause pain in mornings?

It's not unusual: ... To have GERD symptoms in the mornings, considering that a lot of people's reflux is worse when they are lying flat in bed. If you have heartburn upon awakening, I would try antacid such as Tums (calcium carbonate). If you find that you need this more than 2 to 3 days a week, you might want to see your doctor for a trial of a medication. In the meantime, avoid any things that brings on your symptoms. Good luck.