Exactly Petunia. This text (and there's more where it came from) is showing that PTSD is NOT a psychological (only?) disorder...but a medical one.

When the trauma occurs, it causes changes and over time more changes that can seemingly become permanent (though not) but the physical reactions are not caused by our psychological makeup only... (such as the flashbacks etc) but because of the chemical changes the trauma caused.

I'm working on learning about this too...and have been for years also...(SO I might not be relating it exactly, which is why I posted the info.)

My T remains consistent and is probably pleased I'm finally beginning to "get it."