Hi Christina,
I'm a psychologist, PTSD is one of my specialties, so we'll see what I can do here to help.
Do you mean she actually lost consciousness after escaping, or that she just doesn't remember the escape?
If she just doesn't remember it and was still awake, she
dissociated, which means she experienced a split in consciousness that she's now locked away in a different part of memory. (A
fugue, to give a formal definition to how2write's experience, is a dissociative state in which someone travels away from home--the travel is crucial for diagnostic purposes--and takes on a partial or new identity. After they return to their "original" life, they may or may not remember who they were and what they did while they were in their "second" life. Obviously others may tell them what they did, but they may not actually recall. Fugues don't usually last very long, thanks to credit cards and ss#s and the like, which force you to face your identity or at least tend to land you back home.)
PTSD-type symptoms are very, very common immediately after a trauma, and they're actually called "acute stress" reactions unless they last a month or more after the trauma.
PTSD is caused by the brain going into fight-or-flight overdrive in an attempt to keep the person safe in case the danger is still around. So imagine how your MC would be reacting if she were still in her captors' grip, and then keep her reacting that way. Would she be having nightmares? Jumping at every sound? Recoiling from touch?
Symptoms fall into 3 categories:
- hyperarousal - the body is revved up, in a constant state of readiness to fight or flee -- that means the person is irritable, jumpy, has trouble sleeping, etc. The ongoing anxiety makes some people say they feel like they're "on the ceiling" or like they could "come out of [their] skin."
- intrusive - the trauma keeps coming back (intruding on the person's life) in nightmares, flashbacks, panic, etc.
- avoidance - the person tries to avoid anything that will trigger the intrusive symptoms and/or panic reactions. Since darn near anything that reminds the person of the trauma -- from the quality of the light to little sounds to smells and touches -- will set the already-hyperaroused system into a panic state, the person will typically avoid more and more and more things over time.
So I think your MC would be more likely to be jumpy, twitchy, irritable, and afraid, especially if she got herself out of the situation. She'd be constantly prepped to have to rescue herself again. Like the knowledge that she's safe hasn't caught up with her yet.
If her symptoms go away after a few days, she has struggled with "acute stress" rather than formal PTSD, which is, as I mentioned above, a long-term change to the brain and body chemistry.
If you want more specific information on what happens to the brain, I can give you that, but from your question it doesn't sound like you need quite that much info.
You may also find this article (it's not too long) on my website helpful -- it touches on the brain chemistry info:
http://archetypewriting.com/articles/PTSD.htm Let me know if I missed anything or can help any more!
Carolyn