Re: Sinusitis
A colleague at my company had been sick regularly over the past few years. His record came to the management's attention following the introduction of a new sickness monitoring policy.
It transpired that he had frequent sinus problems preventing him from flying. He was referred to a specialist and had an operation which appears to have cured the long suffering lad's problem.
Your case may be different but I would humbly suggest a visit to a specialist to diagnose your very painful and distracting problem.