About gall stones

I had planned to do my first flush next week. I have mild
pressure/pain under my right ribs and many symptoms suggesting I need
a liver cleanse. I did the liver diet and liver herbs years ago and
didn’t feel any different. I have chronic fatigue, fibromyalgia,
etc… Many people with my conditions have found that the cleanse
helps with their overall conditions. My shoulders are painful and
when I added in good fats to my diet the pain became much worse, and
this is one of many symptoms that lead me to believe I need to flush.
I can’t remember when that was but 1-3 years ago while having an
internal vaginal ultrasound I was told they did not see any gall
bladder stones. HERE’S MY QUESTION: I saw a post on this sight that
suggested it was essential to have a gallbladder ultrasound. Is that
true? Or should I just go ahead as I planned? Thanks for any help.