Call your therapist and tell them you are having a crisis. They may can call you in some anti-anxiety pills such as Xanax. It will help you to sleep better also. When I go thru a slump, I have horrible nightmares. Things usually trigger them, like shows where women are abused or children are. I have learned to just turn them off and watch something else.
It takes awhile to understand what triggers your flashback, and I still have difficulty. I know my husband is wanting to watch something so I pick up a book to read. He now knows I can't stand it and he is very sympathetic to me. He knows how my 1st husband abused me. Its great living with someone who cares!