Bad memories flashing back and forth in my head!

It's perfectly fine if you experience that. Oftentimes, those experience place a huge dent in our lives that we can't get past it easily. What I can suggest is you deal with it first. Be completely honest and sincere. Think about what happened it's effect and the reason why it happened. Make your amends by accepting the truth about it. (I won't ask specifically what you experience, I respect your privacy on that my friend). Deal with the persons by forgiving them truly. You owe it to yourself to be free. As soon as you have done this, you can honestly say to yourself you are now ready to move on. There are more to life than these experiences. You can gain back your control of your life. Be happy and be positive. Give thanks for everything that you have and live life to the fullest. Our lives are short. Let's cherish each minute. We won't know when will our time be. Take care my friend.

i think you got a coping disorder the condition is called post traumatic stress disorder the only way to resolve it is face it., or you got some unresolved business way back in your childhood life.