High esr and crp been around 29-40 marks for over 6 months. extreme fatigue, joint pain, muscle pain, nerve pain. what could be wrong?

Probably autoimmune: This is highly suspicious for autoimmune disease such as Rheumatoid Arthritis or Lupus; you need to see a Dr. for testing to further diagnose. Even if it's this conventional medicine offers inadequate/only symptomatic treatment so see an integrative Dr. for treatment.Autoimmune diseases are triggered by chronic infections/environmental toxins. See https://tinyurl.com/y8opon3c for more information.