in general - music, a bubble bath, workbook exercises on whichever is going on, computer games, talking to a friend,

then I have things that also work for each type of symptom like -

Panic attacks- music open a window so I can feel a breeze, putting my hand on a pressure point and thing about slowing the heart beat down,

Nightmares - Bath, music, writing, listening to a friends voice,...list goes on

Flashbacks - music, writing, drawing

sad/depressed - music, biking, cleaning,

Anxiety - cleaning, drawing, writing, music,