Granite, I don't think your feelings are an overreaction--they just are what they are. My experience is that all feelings that are resisted seem to grow bigger and more fearsome. It's like trying to hold a beachball under water--the more force, the greater the push back.

Have you talked to your T about the fear that the feelings will overwhelm you and cause you to hurt yourself? That seems like a worthy discussion to have, and keeps the issues at a bit of a distance which might feel safer.