ChelseaLuv, I'm so sorry that you're experiencing these symptoms, and that you've had such a traumatic childhood.

Yes..........PTSD can contribute to various behaviors, but risky behaviors (like random sexual encounters) could be a symptom of something entirely different.  The only means to sort this out would be to consult a psychological professional that specializes in trauma and domestic violence.  I would also suggest that you seek a psychiatric evaluation, as well.  Keep in mind that both disciplines involve mental/behavioral health, but that they approach treatment and management of issues in totally different manners.  Having typed that, medications for a psychiatric disorder should always be accompanied by counseling therapy with a mature, well-grounded, and highly recommended therapist - recommended by patients, as well as colleagues.

Any treatment will cost money, although there may be many, many resources available to you through Social Services, depending up on your income, living situation, etc.  As it is, you're willing to spend money to hook up with random people and risking extreme consequences:  HIV, various STD's, bug-chasers, and violent individuals who use sex as a means to troll victims.  It would be to your benefit to seek whatever resources are available to you and this is something that you're going to have to decide to do for yourself and yourself, alone.  The "sex addiction" is only a symptom and can most certainly be managed.  But, only a trained, licensed, and well-versed professional is going to help you get to the core of the issues that are causing the symptoms.

ChelseaLuv, you are valuable in this vast Universe - far more valuable than just being an object for continued use and abuse.  You have experienced a number of significant traumas that can be processed and put in their proper places, but only you can determine whether or not you're going to make rescuing yourself a priority - nobody else in the world can do this for you, no matter what they might lead you to believe. 

Best wishes to you and brightest blessings