Firstly I want to know your age? History of Hypertension
or Diabetes? Lipid Profile? Your weight?
If you are around 30 years than you must take it seriously and do your EKG, stress/ Tread mill test and echocardiography
. Rest of the treatment depends on the report. In this age the heart related issue must be ruled out.
Other issue to be ruled out is Cervical spondylosis
If you are teenager, than this could be due to dehydration
or due to some medications you are taking.
Consult your doctor as soon as possible and get treated.