You have gallstones. And probably big enough to cause pain. Or your gallbladder is empty, no stones, but inflamed. It can also cause pain.
How old are you ? Any kids ? Any pregnancies ?
Any medications use during your life ? Hormones? Birth control? Antibiotics ?
Gallstones can cause pain when they stuck into the cystic duct, or into the other bile ducts connecting gallbladder with duodenum.
Sometimes, Gallstones can have very sharp edges, can be calcified, and by moving, may create small cuts on the bile ducts or on the gallbladder.
Both moving and cutting and also stuck stones can create that pain your are describing.
You should at least find out how big your stones are.
Smaller stones can be flushed, larger stones may get stuck inside the cystic duct or common bile duct and may cause a lot of pain, and even more serious problems..
Some stones may also block the common bile duct causing acute pancreatitis.
Acute pancreatitis is a serious condition, and is cured by absolut fasting. No food, no water.
There are risks associated with having Gallstones and doing liver flushes. Research the risks and make an informed decision on what to do.
You may suffer another attack if you attempt to flush again.
Or, you may flush the stone out and may be free from all pain.