Thanks for your query.
I need more information in order to short-list the possible causes.
However, from the brief information provided, the possible causes are fall in blood pressure in erect posture; cervical spondylosis
or Trigeminal cephalgia
(due to a inflammation of FIFTH cranial nerve
responsible for conducting pain sensations from the temple + face + sinus
relevant specific investigations (as applicable) would be required for pinpointing the cause.
Consult your doctor and apprise him of my opinion. I am certain that he will agree with me, order required tests, and- based on the reports- will prescribe suitable/modified treatment as advised.
In case of any further queries, revert back to me THROUGH DIRECT PREMIUM QUERY (Paid), addressed to me personally. You will receive- almost immediately- my response in great details.
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Fond regards and have a nice day
Dr. Rakesh Karanwal