Are you asking if you'll be able to get through to the next flush without having a gallbladder attack?
I have experienced the same thing, where after a good flush, more congestion moved forward right away, into the gallbladder, and caused lots of frightening symptoms,
I worried about the same thing - of having a gallbladder attack, but I have never come close to having one.
Once you start softening and crushing the stones, it is highly unlikely that you will have an attack - just keep taking GCG and keep flushing!
If you do end up having one, which is very rare - chug bag a glass of Epsom Salts and a glass of olive oil, and it will come right out.