Taking Etoricoxib 90 mg for a long duration may increase the risk of heart, kidney, and stomach-related problems, so it should ideally be used at the lowest effective dose for the shortest time possible. The combination of spinal pain and eye discomfort may sometimes indicate an underlying inflammatory condition such as ankylosing spondylitis, which requires proper evaluation rather than only symptom relief. It is advisable to consult a doctor, preferably a rheumatologist and an eye specialist, to confirm the cause of your symptoms and to discuss a safer long-term treatment plan that protects your overall health.