Impatience with meditation

When I meditate I have hard time staying calm or even repeat mantras because my breathing becomes quite fast and irregular. I understand that this is a common reaction of my body trying to release old conditions. Usually there is subtle pain in my throat and solar plexus and I do feel better after each sessions of releasing my old painful memories, but I’m also frustrated since it has already been a few months practicing this without actually entering and staying in the gap. Is there any other methods to help speed up the process of releasing old conditioning other than sitting quietly and witness my body breathe out the emotional debris from the past?