Sudden pain on change of posture- sitting to standing, can be due to postural hypotension
or due to hypoglycemia
- due to starvation
or could just be a consequence of stress of driving.
There are ofcourse various other possibilities - vision acuity (power change), migraine etc.
As long as it does'nt repeat, I think there is little to worry.
Visit a ENT specialist
if dry cough remains, it may not be related
to the pain.
Wishing you good health.