Welcome to hCM,
At this age cervical spondilitis is less likely.
From your history it seems that you might have extra cervical rib
giving rise to this problem.
Go for X ray
cervical region and get it diagnosed.
400mg is vitamin E
and might have given as a supplement.
Take B.complex and Vitamin B!,B6,B12 capsules or injections.
Ok and bye.