gallstone flush

I've been diagnosed with gallstones through an ultrasound. Surgery was recommended which I refused, hoping I could get rid of the stones and related health problems by natural methods. Monday I tried my first gallbladder/liver flush,using Dr.Hulda Clarks's method, and was very sick (nausea, headache,shoulder pain etc.) Is this the way it's supposed to be or am I doing something wrong? Would a 7 or 5 day flush be easier?