Many years ago I did a lot of research on dreaming & dream theory. It is a fascinating topic - there were and remain many lines of investigation regarding dreams and what they mean.
The following points seem to me to be as valid today as they were years back.
1) Dreams are one mechanism by which our sub-conscious mind attempts to deal with physical and emotional issues that usually come from our conscious state.
2) Dreams were once called "‘the royal highway to knowledge of the unconscious aspect of the mind’ by a very famous dream researcher. I still believe this to be a meaningful description.
http://www.psychoanalysis.org.uk/budd.htm
3) If our dreams are troubling us then it is probable our unconscious mind has a message for our conscious mind (over some conflict, a desire, a fear, an anxiety, a past and forgotten but disturbing memory).
4) Dreams can be totally random and meaningless, just a way that our physical mind activates & deactivates circuits and trigger recollections of stored data in a random way. Some think this is like a health system check & the result is we can remember dreams as vivid images that seem odd or strange or fascinating or at times entertaining, also to appear real.
5) Parts of dreams can be and often are influenced by external stimulus such as temperature, physical contact (perhaps even cat walking over chest), a cold, noise, etc: etc:. But often there can be a theme to a dream such as repeated situational dreams.
6) Troublesome dreams are best dealt with when they are occurring but the 64,000 $ question is how ?. The best technique I ever heard about was perfected by a famous SFO psychiatrist in the 1970s. He used to get the person (wanting to understand their dream) in a chair & get them to relax - he had them sit opposite an empty chair (perhaps with a pillow on it) - he would explain to the person that because the dream came out of their own mind, only they really knew what the people, things & events really mean.
He would get the person to close their eyes and go back into the dream and to talk about what they were seeing, sensing and feeling as they revisited it. He would hone in on any obviously disturbing part of the dream. His brilliance was in then getting the person to imagine their self as sitting in the other chair whilst the actual person was told to become the object causing the disturbance - when he sensed the time was right he would often ask the 'disturbance' to tell the person directly why they were wanting to disturb the person. This was often the circuit breaker that allowed the peron to bring the sub-concious part of the dream into their concious mind. Kind of an 'aha - so thats what I was anxious about' result.
The technique proved to be remarkably effective and very quick to get to the cause of a disturbance compared to most other dream analysis techniques I have read about.
What you are describing doesn't sound too disturbing but only you know the depth of this. The fact you have written about is says it bothers you enough that you want to better understand it. That too is a good way to progress your dealing with it.
The message I am conveying is that no one else can really interpret your dream for you, only you can, other people can help you along the path. some may try to guess for the dreamer but guesses aren't really that helpful. Often the answer really is a simple matter and staring the dreamer in the face. Rarely is the cause complicated, just something we fear or are avoiding hence it pops up as a dream.
Anyway, this has turned into a long post. But I hope it may a least provide some insights as to what is going on when we dream. My apologies if it fails to achieve this.
DSM