Flashbacks are when an image of a traumatic event literally keeps flashing in your mind's eye and you feel the like the trauma is happening all over again. This "reliving" of the trauma can be extremely painful emotionally and even physically and is very similar to what you're experiencing. Shame and guilt are a big part of reliving trauma.

I can't tell you if you have ptsd, but it sounds to me like extreme anxiety. Anxiety can make you feel paranoid and being paranoid can make you anxious. I find the techniques don't work for me either sometimes, and crawling into bed is the most soothing thing I can do for myself. Warm showers and baths help too.

Talk to your pdoc about all this. It's important for your Tx that he/she knows you're going through this.