I got quite a lot of pain with my first and the third I think but the pain has got less and less as my liver and gall bladder have started to heal themselves. I am sure that the organs must get enlarged if they are clogged and/or sluggish and that flushing gradually cleans them and they return to a normal healthy organ but it takes time. Each flush appears to have their own character, some uncomfortable other full of stones or without stones. Let time pass, flush every two to three weeks and you will get benefit.
Some people have passed very large stones; my largest was 3.5cm x 2cm. Others have stones that just won't come out. It is reported that stones as large as a golf ball have been expelled. It is important to remember that apart from expelling stones you liver and general health is improving.