I had 4 cervical spine fusions 30 yrs ago. developed a neuropothy of pain in forarms mainly at night. have been on gabapentin for years, and have done very well. over last three months have had balance and dissyness problems and also numbing of my li

Need evaluation: You need a complete neurologic workup to see what may be the cause or causes of your symptoms. Testing after a complete history and physical exam should include: MRI of at least cervical & possibly brain, carotid/vascular studies, blood testing(b12/folate etc) and electrodiagnostic tests. Ekg as well to check for cardiac issues. The testing depends on your health history & physical evaluation.

Adjacent level: It is very possible that you are having one of the adjacent non-fused levels degenerating. Especially after 30 years. This can cause pinching of nerves leading to arm pain as well as neck pain. You need a physical exam, new xrays and an MRI of the neck by a surgeon to evaluate your neck and decide on a treatment strategy.