 [ Symptoms ] do dna skin repair products really work [ Disease ] two things first a ct scan is the definitive test for sinusitis if it was clear then i would question that he is having sinus headaches there are a hundreds of different types of headaches so consider seeing a neurologist for a higher level evaluation second taking decongestants at night is not a good idea because of their stimulent effect and the fact they cause annoying drainage an antihistamine may be considered or perhaps a trial of using nasal corticosteroid sprays to reduce the inflammation