For severe neck pain due to spondylitis, over-the-counter anti-inflammatory medications (NSAIDs) like Ibuprofen or Naproxen can help reduce pain and inflammation. If you experience muscle spasms, a doctor may prescribe muscle relaxants. However, because your pain is severe, please do not self-medicate. It is crucial to consult your doctor or a rheumatologist for a proper physical examination. They can prescribe stronger, targeted medications, suggest physical therapy, or recommend imaging to ensure the safest and most effective treatment plan for your specific condition.