Hi A lax lower esophageal sphincter is quite a common problem . This will usually lead to GERD or gastro esophageal reflux disease that is the acidic content in your stomach can enter into your esophagus and give you a heart burn . Since you also have gastritis simple changes in diet can help you a long way in alleviating your symptoms. Diet modifications such as small frequent meals instead of 3 large meals Avoid carbonated drinks .stop smoking if your are . Avoid spicy food and prefer a bland diet . Also please share the RUT  test resort for further treatment please contact me.