What Is The Treatment For Neck Pain?

HI MY HUSBAND HAS GOT NECK PAIN , WHEN HE GETS THAT LEFT SIDE OF HIS FACE GOES NUMB AND HIS EYES BECOME RED , HE HAS UNDERGONE TREATMENT FOR THE SAME FOR PAST 7 MONTH , THE DR HAVE TAKEN MRI (MIOT HOSPITAL CHENNAI) BUT THEY COULDN DIGNISE ANY , PLEASE LET ME KNOW WAT COULD BE THE PROBLEM , AND HOW COULD WE FURTHER PROCEED WITH THIS