Stuck, if you are insistent on avoiding surgery, you could try the flush and see if you can get an ultrasound afterwards to see if there are any stones left.
I would definitely recommend diet modification, especially since you say that your attacks seem to be diet-related. Mine were mostly after Shabbos, but I didn’t changed my Shabbos diet and didn’t have any more attacks, so it wasn’t really diet-related in my case.
My husband is a self-diagnoser and he was having upper gastric pain. So since we knew that I had gallstones, he figured he did also (ishto k’gufo – LOL). Anyway, he did a flush, was very week for a few days afterwards and did seem to stop having some pains, but he never had an ultrasound before to see if there were in face gallstones. A few years later, he was pain again (not sure if it was exactly the same pain) and I made him go to the real doctors (not the internet kind) and he did have an ultrasound, which showed that he did NOT in fact have gallstones at that time. I would tend to think that if he had had them in the first place then he would have already started having them come back since once you have been shown to have them, your body continues to make them, so the gallbladder would start to fill up again. So really, in the end, I can’t tell you if the flush helped him or not. He’s really the kind who is willing to try any of the alternative remedies before running to doctors, so I’m not sure if this is advice that’s applicable to you.
In my opinion, doctors push you to do what doctors can do for you (have surgery). If you want to try the flush, I would say go ahead, but not if you’re in a full blown attack. Really at that stage, the stone can get stuck in the duct and you could be looking at a medical emergency. If you do the flush, try to get another ultrasound and see if there has been any change. If no change, then you’ll have to decide whether or not to have surgery. The doctors are concerned that what I mentioned could happen – the stone will get stuck in the duct and then you have real problems, so again, better to have surgery when you’re not in a full blown attack.