thanks for writing to H.C.M. for your query.
I have gone through your query regarding your sinus problem, and recurrent effect on your voice and you feel very thirsty.
After considering your coplaints and your old problem of sinusitis
, I would like to tell you that your sinusitis is well known for post nasal drip
which inturn causes recurrent throat infection
thus affecting your voice. Secondarly due to sinusitis your nose gets blocked may be partial or complete thus forces you to breath through mouth, therfore mouth becomes comparatively dry and there occurs urge for drinking something.
After thorough examination and relevent investigations your extent of sinusitis may be diagnosed and accordingly it can be plan for treatment. In the meanwhile steam inhalation will help you.
I hope your query is well explained.