Ligament tears usually heal by 2-3 months. Even after 2 years if you still have pain then it is something to worry about. If the xray is normal, it may not be bony injury. It may be injury related to cartilage, ligament or tendons. Or it may be something else. At this point it would be best to do MRI of the ankle joint to determine the exact cause of pain. Visit the nearest ortho surgeon who can order MRI for you. I cannot prescribe meds as Practo prohibits me from doing so. Good luck!