Am an expat in uae. the cold weather is giving me problems of sinusitis. how do i prevent it? is frequent intake of cetrizine bad?

Sinusitis: Sinus infections are due to obstruction of normal clearance of secretions from them, either to obstruction (physical or physiological), to adjacent infections or to direct penetrance. Not due to changes in temperature, although pressure changes can create congestion. You may have allergies, etc. Chronic use of antibiotics is not a good idea (resistance, allergy, etc.). See an ENT doctor.