It is quite common for neck pain and stiffness to persist even after an injury, especially if muscles and ligaments did not heal completely or if posture habits are still affecting your neck. Since your X-ray was normal and physiotherapy helped partially, the issue is likely due to muscle strain, ligament weakness, or poor neck posture rather than a bone problem. To improve further, continue regular neck exercises and stretching as advised by a physiotherapist, and focus on posture correction (avoid long mobile use with a bent neck, use a proper chair and pillow support). Applying a warm compress can help reduce stiffness, and occasional pain-relief medicines may be used if needed (after consulting a doctor). If symptoms are still present after a year or if pain radiates to the arms, you should consider a re-evaluation, possibly an MRI, to rule out issues like a slipped disc or nerve compression. With regular exercises, posture care, and proper follow-up, most people gradually return to normal.