Don't worry, may I ask which 3 doctors have you consulted ?
I & my sister have similar problem, so earlier, I have asked my school doctor (I work at a school) to recommend good specialist for us. She said the following 3 are most trustworthy in this field:
Dr. Cheung Suk Yee, Polly
Dr. Chan Wai Kuen, Edith
Dr. Chow Wing Cheong , Louis...