Dear forestgreen,
Hello!
I would want to suggest that arthritis in the neck is not the cause of problem in your lower limbs and generalized body muscle pain.
You would need to consult a neurologist to rule of Fibromyalgia and then if required follow up with a Rheumatologist.
For Rheumatoid arthritis you would need to go for an X-ray and Rheumatoid factor estimation and follow up for proper diagnosis. Osteoarthritis can also be ruled out with proper clinical examination and X-ray.
For present pain relief you are suggested to take intermittent pain killers and rest till proper diagnosis is done and a future course of treatment is planned accordingly. Take your appointments near a neurologist and Rheumatologist
Take care!