Sounds like it could be a number of things and I would go have it checked out for sure. Waiting could cause more pain and damage. Good luck and keep us updated. Hope everything turns out ok.
Pain from gallstones usually is in the upper right side of abdomen; and may spread to right upper back, chest, or right shoulder. You might also experience nausea; vomiting; or gas.
Regardless, if you're having back, hip and thigh pain, you should see a Doctor to find out what's going on.
Take Care