It sounds like you have been a very busy lady! Adding up your flushes, you have been flushing once a week. Right? If I were you, I would hold off 2-3 weeks before flushing again. Try some of the herbs to maybe break up the stones and then try flushing again. Everyone is different and you may have many, many stones that will take a lot of flushes.
The important thing is not to give up. Persevere and you will win this battle!