I must say that after the first few flushes I had a bit of nausea, which in fact, I haven´t had in my last flushes at all. But no pain of any kind.
Yes, Mrs Chang prpotocol is a bit different than Hulda´s. have a look at her site ans check it. Remember to call Mrs Chang if you wish she is aleays very helpful and seems to know a lot about how the liver works.
I think your wife could do some sort of treatment before flushing, by taking a bile stimulant(Chinese Bitters or Artichoke Tinctures)Besides a stone breaker wuld also help(Cold Coin grass or Chanca piedra Tinctures).
The first will increase her bile flow and improve her digestion. The second will crunch and soften her gallstones, so when she does her flush the whole process will be easier.
I surely understand your concerns, but I think flushing is very helpful and brings good helath to its doers.
Good luck and keep us posted.
BTW what a lovely husband you must be! Congratulations!!