Hello, My Name Is Roger. I Have Had Pain In

Hello, my name is Roger. I have had pain in my right abdomen, just beneath the rib cage. It's a soreness that feels like a pulled muscle, although I have not worked out or done strenuous exercise for a while. I have been changed to Lipitor (from simvastatin) for cholesterol LDL 90 on last blood test. Could the medication be the problem? I also am having lower back pain opposite of front pain. This does sound familiar to a gallbladder condition but I'm not sure how urgent this is. Please advise.