I have the same case...I'm looking for the doctor too..
My daughter is 2.5yrs and 1 month. I need to take care them by myself until my maid get the visa.
My frist daughter will cry when she sleep, and can't hear what i say. she will ask me to do a lot and say 'i want it now!' or 'i don't want you'<---to daddy.
I know she is sad and she will told me she is not happy. but she can't told me why. but i know because i can't spend too much time to her. She love the little sister so much. she will kiss and hug her by herself.
I know it won't be too long, but i still want to find the doctor. hope he can help or i can know more about my daughter.
I know a specialist, not a doctor, who may be able to train or help you and your kid to handle those problems. My kids are there for almost a year. I find her trustful. She always gives me some valuable opinions and looks at things from other perspective. However, she is in Yuen Long and not sure if it is too far. PM me if you want more info.