4 weeks post op inguinal hernia surgery

I am sorry that you are having problems. Understand that pain is a symptom and can have may causes and it is not always possible to determine exactly what is causing it. It is not unusual to have pain develop several weeks after surgery as you stop taking medications and begin to return to normal activities. It takes many months if not years for full healing. It sounds like some inflammatory process around the mesh, which again, is not unusual. The pain in your legs, especially on the side opposite from your surgery is very difficult to explain and may represent some other issue, which is why the gabapentin may help. Activity has been shown to be better than medication for chronic pain reduction, so I would recommend you move as much as you can, try the gabapentin, and give it some time.