With PTSD, you should walk away from therapy feeling like shit. The therapist should have pushed you in some direction to deal with some sort of fear, regardless the size or scope, they should be pushing you in the directions they believe you must go in order to first face your fears surrounding your trauma. Obviously the beginning session may be slow as it is usually introductory BS to get through, the second session onwards should be into the guts of things. If you walk away feeling warm and fuzzy then that is not the therapist for you, not with PTSD anyway.