The only way I ever worked through my PTSD, was by actually facing my triggers n writing down any thoughts or dreams or hallucinations I had relating to the PTSD.

As to anxiety itself, I use lavender essential oil to help me calm. I also do diaphragm breathing, visualization, and muscle relaxation. Sometimes exercising helps also as it gives me something else to focus on and produces certain endorphins in the brain. Another thing that can help is calming music - like nature sounds, or bamboo music, or water sounds, or even some soothing classical if you like that.