Experiencing chronic, left-sided pain from head to toe for over a year requires a comprehensive medical evaluation rather than self-medication. This type of hemibody pain can stem from neurological issues (like nerve compression or central pain syndrome), musculoskeletal conditions, or systemic issues. You should consult a neurologist or a pain specialist. They may recommend diagnostic imaging (like an MRI of your brain and spine) and nerve conduction studies. Depending on the diagnosis, treatments may include neuropathic pain medications (such as gabapentin or amitriptyline), targeted physical therapy, or nerve blocks. Please do not start any medication without a formal diagnosis and prescription from your doctor.