I'm not understanding why you don't have your gall bladder removed. I've had attacks, so I know how excruciating they are, but in my case, there were no stones involved and the gall bladder showed up on tests as 'healthy'--i.e., they could find no cause for the attacks. However, in my reading, I learned that if you have stones, you risk all sorts of serious complications, and having surgery as an emergency should definitely be avoided. Every doctor I know recommends removal under the circumstances you describe.
However, back to your initial question about cholesterol. It won't help to monitor your dietary cholesterol because your body regulates the amount of cholesterol it wants--i.e., you eat less, it makes more. And the mechanism which converts cholesterol into gallstones isn't under our control, anyway.
My own attacks were brought on by any high fat eating, and that may be a problem for you.