Yes, there is treatment for highly sensitive hearing. The treatment I am aware of was developed by Dr. Berard in France about 35 years ago. Dr. Berard's work was based on the work of Alfred Tomatis. It is called
Auditory Integration Training (AIT) and is available in the USA and other countries as well. It can be used to help with several different conditions as well as simple sound over-sensitivity. Some of these conditions are:
closed-head injury, learning disabilities, dyslexia, autism spectrum, ADD spectrum,
Down Syndrome, Rett Syndrome, Angelman Syndrome, Williams Syndrome, episodic or major depression
Go to this web address for more info including locations:
http://www.aitinstitute.org/ait_and_brain.htm