actually you seeing something and reacting means you need to work on your "distress tolerance" (a DBT skill).

I know cuz I just had to go through it for similar reasons.

In other words - do NOT have him cover it. And use your DBT skills to let your anxiety / stress / urges pass......... This maybe a great thing for you. It may allow you to deal with a "real life" situation and conquer it while in a group setting.

God bless.