Nick,

You should wait for the counselors to instruct you. Trying to do this yourself will not be productive without the support of the counselors/therapists.

Trust them to help you.

Plus, you do not want to interrupt the process they use.

And yes, it is psychological. You are micro-analyzing every moment. Stop that.

The barber shop probably had too many sounds. Did you have some ear plugs with you?

Do you have a note with your driver's license that explains you over-reaction to confrontation and sounds?

Slow down and take one step at a time, and stop trying to fix this in a hurry.