PTSD is a mental health disorder caused by exposure to a disturbing or distressing event, such as having your life threatened, experiencing sexual violence or suffering a severe injury. Although it’s quite common for people with PTSD to abuse substances, I’ve never heard that the drug abuse itself that causes PTSD.

Over the course of the week following moderate use of MDMA, you may experience things like irritability, anxiety, depression, and memory and attention problems. I’m guessing the anxiety you have now is the result of abusing the drug.

Though if bad experiences when using it is traumatized for you then you might develop PTSD. No one here is an expert who can diagnose you though. I suggest you seek for a professional help.