Long-standing one-side head and body pain may be due to conditions like migraine or nerve-related pain, not something to self-treat long term. Deanxit is restricted in many places and should not be restarted without a doctor. Instead, doctors usually suggest safer alternatives such as low-dose antidepressants or nerve pain medicines (like amitriptyline, duloxetine, or gabapentin), depending on the cause. Please consult a neurologist or physician for proper evaluation and to start the right long-term treatment rather than taking medicines on your own.