I Recently Found Out I Have Gallstones But Gallbladder Is

I recently found out I have gallstones but gallbladder is fine. I had an acute pancreatic attack last week. I see gallstones can be a cause of the attack. I have had 3 in my lifetime. I also have MS. Could the cause be from a particular medication or food? I am on strict diet and eat peanut butter everyday? Could that be a cause?