It’s very common to have that panic reaction to old memories coming up – whether they’re serious or innocuous. I would be careful not to over-interpret that reaction. I think that’s very chemical.
And it’s also very common to not be able to tolerate music or other fond things from your pre-ordeal life while you’re still in the ordeal, because the contrast is so painful. You won’t be going back to exactly your previous life, you will be moving on to an even better life, and, once you recover more, you *will* be able to re-integrate things you want to keep from your previous life.
My informal observation is that people tend to recover from AR faster than from w/d.