Can a weak immune system cause problems with the gallbladder?

A friend was recently diagnosed with Chronic Fatigue Syndrome. He also had to have his gallbladder taken out because it was not functioning. Many believe that CFS is caused by a wreaked/improper functioning immune system. So I was wondering if a weak immune system could also lead to gallbladder problems. Conversely, is it possible that an improper functioning gallbladder could create the symptoms of CFS (since there is no definitive way to tell if someone has CFS, is it possible that the malfunctioning gallbladder led to a misdiagnosis? Is there any scientific evidence which suggests a connection between the two? Or is CFS and a malfunctioning gallbladder entirely separate disorders?