Hello and welcome to HCM,
The symptoms of neck pain
, neck muscle stiffness suggest strain.
Strain is caused due to muscle pull or muscle stretching.
Rest to the muscles and muscle relaxants will be of help. hot fomentation can be continued.
Consult a physicain for clinical examination and prescription of appropriate medication.
The head ache can be associated with the neck muscle pain
The inability to focus eyes properly can be due to refractive error
You need to visit an ophthalmologist for checking the refraction
Thanks and take care.
Dr Shailja P Wahal