My sister did the same like your brother and ended up with diarrhea too. It is very common but it doesn't happen with everybody. A friend of mine underwent a surgery and feels much better now, but he was so young by then around 17 yrs old, which might be a factor of having no complications.
I flushed 6 times now. I know you wanna know how I feel now. Well, not done yet as my case is a little bit complicated as a HIDA scan showed no GB, which means it is either blocked or full of stones. So I am not expecting to be fine with 2 or 3 flushes.
BTW, I posted another topic few hours ago surveying how many flushes it took people to get rid of pain.