From my perspective once you start flushing you should not stop.
You can try Miracle mineral solution as a complement to the flushes.
And if the flushes do not give any result you have to change the way you are doing them. One impotent thing with flushing is to feel the pressure from the gallbladder before you flush. This u can feel by eating more fats the days before the flushing day. Sometimes i have done spontaneous flushes with no preparation at all when I have felt the pressure in my bladder with good results.
And if the oil and lemon is a issue then change them. melt butter and drink. :)