What you are discribing is not paranoia or psychotic, it's panic and acute anxiety, I have these pains in my chest too, I even get it in both my arms, it's very painful. I am sorry you have been experiencing this.

If you are having sui thoughts off an on you need to talk about it with your therapist, that can happen with PTSD too, I experienced that myself. Always remember, they "do" go away and so does the panic attacks/anxiety attacks.

It sounds like you opened up some wounds in therapy, unfortunately in therapy the PTSD can get worse before it begins to improve, but it "does" improve to where you can understand it better and slowly gain more control of it.

((Comforting Hugs)))
OE