I am on no medication, am not a worrier and have no particular problems at the moment, but I have been having these terrifying nightmares for about 10 years. Initially weekly, now every few months. The subjects are on occasion, so vile I do not describe them as it is the best way of eventually forgetting at least the detail.
Recently, when I wake from them my body is in full flight or fight mode, with that buzzy feeling you get with an adrenaline rush, which often stays with me for hours.
I have done some googling and these dreams seem to be particularly connected with the menopause/PTSD, although this doesn't preclude other people suffering from them. The only potential remedy I have read is having small protein dense snack just before going to bed. This snack was defined as a small plain biscuit with butter and small piece of cheese/ham/cold meat.