What are the symptoms of gerd?

i feel air in my stomach just after meals for several hours accompanied by belching.does it relate to gerd?

GERD, or gastro esophageal reflux disease is a common disorder.
Symptoms include: a burning feeling in the throat (heartburn) and epigastric pain.
it is caused by several different things one of which is a weakening of the sphincter at the opening of the stomach, acid then flows back up into the esophagus and can cause ulcerations.
Treatment is usually with medications such as prilosec or protonix which are acid pump inhibitors and reduce the acid produced by the stomach.
Sitting up for thirty minutes after eating can also assist gravity in keeping acid where it belongs. In severe cases surgery to repair that sphincter is performed.
Your description of your symptoms doesnt sound like GERD.
Good luck finding the answers you are seeking.

it could be GERD

It could, but it sounds more like you have lactose intolerance. See if it gets better if you avoid dairy products (or worse if you consume dairy products).