Sometimes it is indeed easier to hide or run. And that is okay. Sometimes you have to do what you need to do to feel safe.
I've got a lot of weird triggers. I've stopped hoping that anyone will understand.
When you get triggered, step back, take a deep breath, and remind yourself that you are okay. Easy to say, hard to do. Avoidance, distraction, self-reassurance... those are all tools to coping.
And if it's any consolation, I hide too, sometimes. When I get overwhelmed, I crawl under my rock (emotionally) and withdraw. People don't understand. They think I am being overly dramatic or wallowing in pain that I should just "get over." You don't just "get over" PTSD.
*hugs*