BTW I am on disability with General Anxiety Disorder which is both audio and visual sensory triggered. In other words I'm non phobic. My personal experience in this comes from being diagnosed as ADHD over 35 years ago. I had a reaction to Ritalin and was taken off. Other neurological deficits are there as well that support CAPD but in the mid 60's who knew? IN 1994 I went into full anxiety disorder that the doctors couldn't figure out. Anti-Depressants were used and again a reaction took place. I found the answers to the puzzle in DR. Levinsons Book Phobia Free. For the first time the ADHD {he still uses the term} and the General Anxiety Disorder came together as a problem of a single origination.
A couple of years ago HBO did a special on Panic Attacks remember it? I do as someone taped it for me. That documentary was made to set off attacks in a substancial portion of persons with anxiety disorders due to the special effects they employed.
Here is the problem. What you see and hear must be interpited and processed for response from the brain. One of the portions involved in this is called the Fight / Flight portion close to the stem I think. Persons such as myself can watch a sitcom be laughing at the show and at the same time be in pre-attack or in an attack itself. The sensory system is sending danger signals to fight / flight. If you do not respond as the brain sees appropiate for the condition you get cognitive conflict or anxiety attacks. Finding the offending events takes a little detective work but can be done fairly easy by keeping a note pad handy. BTW this is the same situation that gives you such nice things as fear of heights. The brain is designed for survival. It like a computer runs checks on your CNS. Now let's say you are up on the roof and feeling uneasy or even down right cared to go to the edge. Is it a phobia? No! Not if you have Inner Ear damage known or unknown to you. The brain in it's checks and balances see's a problem or danger with you being in a high place. The fear is a defensive response to that. You may not realize you have poor balance but the brain knows the fact well.