From what you wrote, it doesn't sound as though these dreams really qualify as nightmares. However here are links to 5 articles, from PsychCentral's archives, that may be of some help with regard to figuring out what these dreams are all about; 3 on the subject of nightmares plus 2 on the subject of dream interpretation in general:

More Than a Dream: The Science Behind Nightmares | Change Your Mind, Change Your Life

How to Eliminate Recurring Nightmares

The meaning of your nightmares | Unleash Your Creativity

How to Analyze Your Dreams (And Why It's Important)

Interpret Your Own Dreams - Some Guidelines | Healing Together for Couples