What can i do for underactive gallbladder? had gb ultrasound w normal result, but suffer from gb attacks, especially diarrhea. seems not enough bile

Cannot diagnose: Strongly suggest that you see a GI doctor. An ultrasound may exclude clinically relevant stones but does not effect functionality of gall bladder. Do not know what gb attacks are in your case, but you should definitely be seen, diagnosed and management options discussed.

See a surgeon: Lots of conditions seem like gallbladder attacks, but a normal ultrasound isn't final. One condition, called biliary dyskinesia causes cramping (instead of emptying), despite a normal us. A surgeon may order a pipida with ejection fraction which can detect gb dysfunction. It may cause an attack to do so, but that is a very good way to tell if you have this problem. See your surgeon.