Bebop,
His pain "coming and going" can be a sign that the stones are moving in the duct...add in the nausea and he may be presenting with a serious problem.

The following is copied from the National Digestive Diseases
NIDDK/National Institute of Health

What are the symptoms of gallstones?

As gallstones move into the bile ducts and create blockage, pressure increases in the gallbladder and one or more symptoms may occur. Symptoms of blocked bile ducts are often called a gallbladder “attack” because they occur suddenly. Gallbladder attacks often follow fatty meals, and they may occur during the night. A typical attack can cause

• steady pain in the right upper abdomen that increases rapidly and lasts from 30 minutes to several hours
• pain in the back between the shoulder blades
• pain under the right shoulder

Notify your doctor if you think you have experienced a gallbladder attack. Although these attacks often pass as gallstones move, your gallbladder can become infected and rupture if a blockage remains.
People with any of the following symptoms should see a doctor immediately:

• prolonged pain—more than 5 hours
• nausea and vomiting
• fever—even low-grade—or chills
• yellowish color of the skin or whites of the eyes
• clay-colored stools

Many people with gallstones have no symptoms; these gallstones are called “silent stones.” They do not interfere with gallbladder, liver, or pancreas function and do not need treatment.
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Best wishes to both of you...

Catherine