Hi, PD.
I've recently come in close contact with PTSD/PTSS, and am still dealing with it. It was only after my PTSD symptoms began that I became interested in stones and crystals, so I'm not sure how accurate this is, but here are the stones I was particularly drawn to:
1) Amber. After the accidents, I surrounded myself in amber as much as I could, only owning one pair of amber earings and an amber ring. This stone felt so vibrant to me afterwards; I think this is because it feels like an organic stone more so than the rest because it's origin is in trees. I'm not exactly sure why actually, but I needed amber around me for several weeks, and I still wear my amber ring constantly.
2) Hematite. I carried a hematite pebble with me everywhere, and I would take it out and just hold it when I got a spare moment.
3) Clear quartz. This is one of my favorite stones, and it just made me feel clean to hold it.
4) Citrine or Carnelian. I prefer citrine. There were some days I just didn't want to get out of bed, but I knew I had to. Citrine (and carnelian, but to a lesser extent for me) made me feel all sunny and energized, which I deffinately needed back then.
5) Amethyst. Again, I'm not sure why. It just felt necessary at the time, and it still does.
Interestingly, I was not drawn to rose quartz, which is odd because it feels like such a cozy stone to me, like a roaring fire and a cup of tea type of stone. I think this is because I wasn't feeling anything even remotely close to that at the time, and so the stone just had no effect on me.
Hmmm...looking over my list, I think that the clear quartz and the hematite were probably the most important to me at the time. I don't know how to describe it, but they were just vital to me back then.
Actually, I came to think of amythest, clear quartz, citrine, and hematite as my "power pack" of stones. I still use them quite often. I'm thinking of buying four tiny pebbles - one of each - and a small leather pouch to carry them around in. I would add amber to the pouch, but it feels a bit too fragile, and I have my amber ring, so I don't think it needs to go in the pouch.
I hope this list helps even a tiny bit. Good luck! My thoughts are with you.