Such treatments as Brainspotting and EMDR indicate that memory of traumatic events may be state and pathway dependent in the brain. Due to the brain’s plasticity these interventions have been know to “reset” the memories of the trauma. My best guess is that the sleep deprivation and the marijuana are somehow blocking the pathways accessing these memories, but of course that would be pure speculation. Here is an article about what scientists believe is happening in the brain during Brainspotting that might shed some light on what is happening.
Regardless of why I believe the more important take-away is that there is an indication you can get relief. I highly recommend you arrange to meet with a trauma therapist (check out the find help tab at the top of this page) who can guide you toward interventions that don’t require you to sleep-deprive yourself or get high.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral