Someone told me that if bad memories keep popping up when you are not really concentrating on anything, it may be PTSD. I was doing quite ok last summer when I was focused and working hard on something. Recent contact with my estranged mother then triggered a period that when I wasn't focused on a project, like when waiting for the bus, all these bad memories would take over my mind. That's when I was told it might be PTSD. Finding a counselor (good luck finding one without his or her own agenda) to just ramble too may help, or just ramble on here, it helps me somehow to just get it "out". I don't believe in a lot of psychological theories, but do kind of believe that the memories coming back can mean it's time to process, sort them out, reconcile some of the dynamics, then move on.
For me, it worked good because with all the bad memories of crazy ass abuse (triggered by her then current need to start up where she left off many many years ago when I cut off contact) helped me see how much better a person I am, not only better than what she believed but so much of a better person in so many regards than she ever hoped or tried to be. That helped me so much.
Good luck!