Dr C K Wong (黃重光) is a very famous child psychiatrist in Hong Kong. He is the Honorary Professor in CUHK. You can make an appointment. However, consultation fee is extremely expensive, which takes plenty thousands.
I think you need to seek urgent advice from psychiatrist instead of psychologist as your son has already developed suicidal ideas. It is better to seek medical/psychiatrist advice first as your son may need antidepressive drug, which cannot be prescribed by CP. The psychiatrist may refer you to CP if necessary after assessment. Don't wait anymore.
Dr C K Wong is a very famous psychiatrist in HK. His specialty is child psychiatrist. I had chances to act as an observer many years ago, while he was treating cases of child abuse in Prince of Wales Hospital. He has had started private practice for around 10 years. The consultation fee is really expensive, about $3000. But I think it really worth. He also has a co-partner CP who work with him.
I had read ur post before, and read the story written by ur boy I feel rare that he could write such curel fiction(bk mamis comment) but afraid the samiliar type of movie I cant refer u any doctor but the other mami has, if you need advice from an odinary c9: I think you should try to develope a sport with ur son, let him do more excruise to train up his body, to kill his time from over imaginemation which make him scare finally, pls dun mind if there are many wrong spellings