Yes, unfortuantely I started getting them after I did several flushes. I haven't been able to find a way to get rid of them yet and this is going on almost 2 years now. Through my nutritional pharmacist the attacks are less severe now, but I still get them and am in significant pain most of the time. I think what happened was that the first flushes I did shifted things around in there now and I have larger stones either coming forward or causing the gallbladder to spasm.
I would say if you are going to flush, make sure you do all the proper preperations and you will be fine. I am a very rare case indeed.