Incest Survivors Support Group
Incest refers to any sexual activity between closely related persons that is illegal or socially taboo. Consensual adult incest is very rare. Incest between adults and prepubescent or adolescent children is a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood trauma. If you or a loved one is a survivor of incest, join the group...


What kind of real life support do you have?
In the meantime there are coping mechanisms you can adopt to remind yourself that you are in the present and safe now - connect physically with something around you, eg.plant your feet on the ground and focus on it, pinch yourself, hold an object. You can also try to remind yourself that no flashback lasts forever, they all pass eventually.
I wish you all the very best
I am also in my fifties. I had planned on living my life without dealing with the incest in my past (it's so ugly) but finally realized my health would probably never improve if I didn't confront it. By coincidence (NOT) this realization hit me soon after my father died.
I'm glad you've reached out - there is a lot of great wisdom and support available. You are not alone!
I also want to let you know that there is a PTSD group on DS where people have lots of experience dealing with flashbacks and other overwhelming symptoms.