Lets look at the two pains as different things, after all people can have more than one complaint at a time.
Left hand abdominal pain is very commonly cause by the colon.
Right hand abdominal pain at the rib margins is usually caused by the biliary system, most commonly the gallbladder but also the bile ducts and a muscles that control the flow of bile.
Other possible causes could be the dysfunction of the ileus sphincter. The valve that separates the large and small colon. This gives very confusing symptoms which can mimic many other condition. Also small hiatal hernias can give misleading symptoms but are usually also accompanied by some reflux.
Sticking to the most probable causes of colon and biliary it may be that Liver Flushing has resulted in a temporary IBS type condition that will ultimately disappear when primary problem of biliary pain is solved. Biliary pain without stones has been studied and in many cases found to be caused by spasm in the gallbladder muscular wall which distorts the gallbladder shape. It can also be caused by soft fatty Gallstones and sludge.
Liver-flushing removes any sludge and expels stale bile: 20 flushes is usually enough but several people, including myself, have continued to flush but in time have achieve relief. The key is to find out why the gallbladder enters spasm if in fact this is the problem. Back injuries and poor spinal health cause by bad posture can do this. It is important to make life changes as well as doing the liver flushing.