Hey, I'm someone with PTSd and depression as well. I go to open support groups that my counselor suggested. It gives me some security and contacts that I can call when things aren't about my drug use. You could always ask your therapist where and when the support groups are for your issues. Even if there isn't a PTSD specific one in your area there will probably be a grief/loss support group available.
Good Luck,
Chavo