I have described to my psychiatrist how there have been occasions I have 'blacked out' in reaction to a fearful situation. Actually, 'whiting out' is a better description. This has happened at times I have reacted to a threatening situation with a bone-jarring fear. At these times I have been convinced I was going to die. I 'white out' (yes, things go white). I come to discovering I have lost time. (it is humiliating wondering how long I stood there and if I did anything during that time). He has suggested this is dissociation. I don't know much about it but is this something common with PTSD?