There are other treatment for sinusitis like antihistaminic and steroid spray and for chronic sinusities they are doing some laser treatment .
Pl take a second opinion . Too much of antibiotics is not good. Meet some other ENT doctor.
Also rule out other causes of headache - migraine / hypertension .
Hi,
Do consult an Allergy Specialist.There is a condition called 'Allergic Sinisitis' which could be a result of your being allergic to some food/beverage or cloth item which you use regularly.Have a Blood Routine examination,see for ESR levels,raised ESR levels are suggestive of some infection . Prolonged Infection can evoke an allergic response it cause pain in your head and sinuses.
See a Orthopaedic Consultant to rule out Spondylitis of the neck,a condition due to the wear and tear of the neck bones.