It might take more flushes than the 2 you just had. Most stones are cholesterol stones and they are soft. The calcified ones sink in the toilet and they might be white or black. You should wait till you have done 8-10 flushes, before you get impatient. The oxy will give you gas in the beginning if you are toxid. Keep cleaning you will get there and don't expect your doctor to believe in any of this.
Read the FAQ at the top of the page about peoples experiences.