I have a question for you: If this was a biochemical problem with one of your son's organ systems, and it was not working correctly and it could be solved with medication and a little therapy, why would you avoid medical intervention for him? When anxiety interferes with life to the degree that you are "desperate" to help him, why not look for the most effective way? If you do not know how to change the chemistry in your own brain (and who does?) how are you expecting him to do that? He has a very treatable problem.
We have a child with extreem anxiety. We did not like the idea that she had this problem, and of course we did not like the idea of medication because so many people with who do not have this problem think that we did something wrong, we didn't, it is a pysical problem, nothing more, and NOTHING LESS. The differnce was night and day for our daughter. She can get on the bus. She can use a public toilet. She does not run when she hears a loud noise. She smiles. She is not afraid of everything.
You have no idea how many adults I have talked to who are angry whent they are finally treated and they realize that they did not have to grow up in missery.
I would no more let my child live this way than I would let her live with a broken bone that I did not what to set because of what people might think. You do what you need to do to make your child healthy, no matter how some people may look down on you because of it. There is nothing wrong with treating real health issues, and brains are part of the human body and sometimes they need to be treated, just like every other organ system, sometimes, they do not work the way that they are supposed to. Brians are no different.
Talk to your doctor. Don't wait, and don't feel guilty if you decide to give your son the medicine he needs to feel better.
M.