An additional test for the gall bladder would be a HIDA scan with ejection fraction. If your pain is due to reflux disease, this can turn out to be important. Prevention of reflux is necessary to prevent long term scarring of your esophagus. If you hate bothering your friend, see a colleague-don't sell your health short due to guilt. Usually about 30-45 minutes post prandially.
Fatty foods are usually worse.
Apples and cabbages are also offenders. Occasionally the pain can be felt in the chest, left jaw or left arm. Generally, a feeling of nausea and right upper abdominal discomfort. Jaundice can result if stones obstruct the common duct. There will be marked pain in this situation.