I agree very much with Veiled - nightmares can be symbolic of feelings - it may be related to feelings and emotions from your trauma/s, but just illustrated in your mind in a different way to what actually happened.

I rarely get action-replay nightmares (thankfully), but I get a whole load of really unpleasant nightmares where I feel the same as I did during my trauma/s.

I guess I can just echo Veiled - don't panic and keep an open mind. Speak to your doc etc.

Take care