Hello, 
Thank you for asking the query :

May I know what specifically did the HIDA scan find out ?( what exactly do you mean by 'diseased gall bladder ). With this information I will be able help you in a better way.

You can reply directly to this email.
Thank you

Hello,
Thanks for the reply.

1.Your current symptoms in the pelvic area does not seem to be related to a gall bladder disease. It could be something else like a diverticulitis, appendicitis, colitis, pelvic inflammatory disease etc, which can only found out by targeted investigations and evaluation. 

2.With a gallbladder surgery you might not be getting a symptom relief.

3.But I would not brush of the HIDA scan as a false positive finding. The false positivity rate of the scan in low (or the test is rather specific). So it need to be found out why the GB is not contracting. Is it because of some obstruction or clacification etc. 

So please discuss with your Doctor. You questions are really valid and you should ask your Doctor whether the gallbladder surgery will address the current symptoms. Further evaluation should be undertaken for both - the gallbladder and the pelvic pain.

Hope this helps.