I visited HK often from 2002 after my hu*****and moved to HK to work.
And finally I move to HK end of 2007. And I am so easy to get sick after I moved there. Coughing, headache, all kinds of desease. And I feel low energy often.
Now I came back to my hometown for a short vocation. All the symptom disappeard. It is really tough for me to like HK.