sinus or tonsil

i have sore throat. when i talk continuously i feel severe pain in my throat. when doctor tested they said i have tonsilits. and now my voice is changed.
he said because of sinus .
i dont know what is the problem for me ,is it tonsilits or sinus.

[Enoch Choi, MD]

A change in voice depends on affecting your larynx where the vocal cords are, lower than the tonsils and sinuses.  The way those can affect your voice is that post-nasal drip can irritate the larynx, and infections of your tonsils can extend down to your larynx.  Also, trying to clear your throat can cause nodules and strain to your vocal cords.  Go see an ENT to have them directly visualize your vocal cords with a laryngoscope.