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is likely to be responsible for the neck pulsations....
There could be pressure on the adjoining nerve
leading to numbness
You will need physical examination, ECHO and/or Doppler studies for further assessment and assistance..
You have not stated your personal habits, family history, or co-morbidities, even age or gender!
The treating doctor alone will be better placed to judge based on his assessment of the situation.
Wishing speedy recovery