I am thankful I found this post since I have been experiencing the same symptoms: pain and tightness on the right side of my abdomen. Sometimes nausea at night. My GI doctor promptly prescribed a CT scan. I would like to advise everyone here to avoid having CT scans without researching side effects of this procedure. The amount of radiation released into your body during a CT scan is several hundreds of times that of regular X-rays. This can lead to cancers later in life. I opted out and decided to have a blood check to make sure liver function is ok. If all ok, my pain is probably caused by scar tissue or adhesions formed after emergency gallbladder surgery. Not much to be done about that..