EMDR (Eye Movement Desensitization and Reprocessing) is a post-trauma stress syndrome therapy.
It is therefore adequate for people suffering from certain forms of anxiety following a traumatic event.
Its specificity is sensory stimulation, mainly applied through eye movements. However, it contains elements of many effective psychotherapies in structured protocols that are designed to maximize treatment effects. These include psycho-dynamic, cognitive behavioral, interpersonal, experiential, and body-centered therapies.
EMDR has been developed in the USA by Francine Shapiro since 1987. Many clinic studies are available on this therapy. My advice for this therapy is to choose an experienced practitioner, certified by the EMDR Institute (or your regional/national EMDR Institution). I am usually not that formal, but it is particularly important for this therapy.
Another efficient technique to work on traumatic memories is visualization. Choose a practitioner with a psychotherapy/ psychology background, because this powerful technique should be practiced in a clear and appropriate therapeutic context. We are not talking here about visualization as utilized in relaxation, but visualization as a reprogramming of your memories.
Reliable resources to explore: EMDR Institute EMDR Europe