Hello Welcome in H.C.M. I have gone through your query regarding clogged ear, pain in ear and dizziness with sweaty palm. No doubt sinus infection puts out infected discharge to nose from time to time and this later reaches the throat by post nasal drip and in this way there develops sore throat. Once throat is infected than there appears oedema at the opening of eustachian tube and therefore this tubal opening gets blocked which results in negative pressure in middle ear and that you feel as blocked ear. This blocked ear some times interfere the vestibular part of inner ear and that results in dizziness. I wish above answers your query. Regards.