Why should you flush? 90% of ALL human beings have gallstones, so chances are pretty good you have them.
You will also need to do a series of flushes every 2-3 weeks until you see no more stones.
For your chronic constipation, have you thought about a colon cleanse? I would also recommend calling 1-800-herbdoc and requesting a free catalog from Dr. Richard Schulze . That will put you on the mailing list for his monthly newsletter. The catalog will also give you information on colon cleanses.