Hi and welcome to the forum! I am glad that I can help you.
You want to know why you experience pain in the upper right abdomen after gallbladder removal.
The gallbladder is usually removed when gallstones form inside it. The surgery can be done with laparoscopy (when instruments are placed in the abdomen through small incisions) or with open surgery. The lack of a gallbladder may have no negative consequences in individuals. In 5 to 40% of patients a condition called postcholecystectomy syndrome may appear. This condition is characterized by chronic pain in the upper right abdomen and gastrointestinal distress.
Given the data that you described, it seems likely that you are experiencing postcholecystectomy syndrome. Consult a gastroenterologist for further advice about its treatment.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about diagnosis and treatment options.