Thank you for the query.
Yes, it can be your gallbladder
indeed. Especially if the pain is in the upper right abdomen and radiates to the back. Nausea
should be also present. The pain should be related to the meals.
Other possible reasons of your pain is rib nerve irritation
due to its compression or inflammation in around. Such pain is usually sharp, well localized, aggravates when moving the chest. Such nerve problem can be caused by spine disc herniation for example.
I suggest you to visit your doctor, have abdominal ultrasound
, blood work and liver
tests. If nothing will be found, you should visit orthopedist and consider muscular or nerves related reasons of your pain. Spine MRI might be helpful.
In a meanwhile you may try Diclophenac 50 mg twice a day (should be prescribed by your doctor, should be taken with Omeprasole 20 mg once a day).
Hope this will help.