Dr Koay Cheng Eng (the brother of the much-mentioned Dr Koay Cheng Boon) is very good. He is soft-spoken and has a lot of empathy. By the sounds of it after reading of others' experience with Dr Koay Cheng Boon, he's very different from his brother.

Dr Koay Cheng Eng now operates out of Sunway Medical Centre, no longer out of Gleneagles. (Dr Koay Cheng Boon seems to have run into some... "legal problems" so Dr Koay Cheng Eng has taken over his brother's clinic there.) Dr Koay Cheng Eng has solved sinus problems for so many of my family members. Be prepared to wait a while to get to your turn to see him though, he's very popular.

I dont think clinic would be sufficient, best to see and ent specialist so they could scope with a cam and really see the issue and diagnose it correctly the first time.