Hi there and thanks so much for your question. I am very sorry to hear all your challenges you have had in life and congratulations for dealing with them although I know you feel some challenges and I hope I can help you.
From your description it looks your current symptoms are really affecting your lifestyle and you should really take some action about it.
From what you say of being born with low oxygen that may have affected in how other senses have developed and integrated. According to the Sensory processing disorder foundation, Sensory Processing Disorder (SPD, formerly known as "sensory integration dysfunction") is a condition that exists when sensory signals don't get organized into appropriate responses. Pioneering occupational therapist and neuroscientist A. Jean Ayres, PhD, likened SPD to a neurological "traffic jam" that prevents certain parts of the brain from receiving the information needed to interpret sensory information correctly. A person with SPD finds it difficult to process and act upon information received through the senses, which creates challenges in performing countless everyday tasks. Motor clumsiness, behavioral problems, anxiety, depression, school failure, and other impacts may result if the disorder is not treated effectively.
In my opinion I want you think sometimes that you just went out to a club or a dance house and came back home and you felt the sound "banging" in your head. Few years ago I found it fascinating why that would happen and the truth is that the auditory system is really wonderful and sometimes our auditory nerve stores conversations or vibrational sound frequency and then the brain plays it even if we don't want to play those sounds.
Your dad is right an anxiety and stress can have a major influence on other organs and our life in general so that i sway you need to take action and make sure you find ways of managing stress more effectively. Exercise and meditation play a huge role in how you deal with social anxiety and stress and excellent for the brain
Here was one of the latest studies that i wanted to share Changing Brains for the Better: Article Documents Benefits of Multiple Practices, Such as Physical Exercise and Meditation
ScienceDaily (Apr. 18, 2012) — Practices like physical exercise, certain forms of psychological counseling and meditation can all change brains for the better, and these changes can be measured with the tools of modern neuroscience, according to a review article now online at Nature Neuroscience, copy and paste the following link http://www.sciencedaily.com/releases/2012/04/120418095456.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fmind_brain+%28ScienceDaily%3A+Mind+%26+Brain+News%29
My suggestion is that you should get checked and make sure there is nothing else, If it is an auditory nerve or inner ear to stay away from "unwanted" noise and practice meditation before you go to sleep and once you woke up in the morning. it is really important that you have a calmer mind and a focused brain.
What kind of work you do? Make sure you are not surrounding yourself from this unwanted noise and challenges when comes to social anxiety. Exercise and meditation again are your best formula for a healthier and happier life.
To practice meditation sit down in a quiet place and breathe deeply twenty times making sure that every time you breathe you are focusing in breathing properly and achieve a sense of calmness. There is a meditation expert that teaches meditation, Sharon Salzberg and you can follow her tapes. I really hope it starts feeling better and not hearing that unwanted noise, it must be very uncomfortable!