Amitriptyline & Gabapentin for 15wks + physio. Cervical MRI = loss of lordosis & osteophyte C5-C6.My shoulder is still painful. What else can I do?

Neurosurgeon opinion. This opinion will give you the best answer. The problem appears to be the osteophyte and may reflect pressure on a nerve. It does not necessarily follow that this is the cause but may be a cause. The physiotherapy and meds are a conservative way of treatment. Has the pain gotten better? If so can you live with what you have? See the doc Best to you.
See specialist. A Pain Management MD, Neurologist, or Orthopedist may be able to do injections / facet blocks/ or alternative treatment to specifically address your pain. You need an evaluation with a specialist.