B19 wrote:
Could be something related to a repressed memory which is surfacing in fragments and/or metaphors, trying to make its way from the unconscious to the conscious. You could try getting a journal and when you are in a good space and relaxed, try having a written dialogue with the 'mutterings' which surface without conscious awareness.
Your considerations about repressed memories are interesting since I had lots of anxiety - often from an unidentified source - as a child. But the content of unpleasant memories or mental images seems so heterogeneous that it feels unlikely to that they would contain some deeper message. And they seem to be in line with how I feel (negatively) about actual social situations. Also, my unpleasant memories are probably not linked to early childhood (2-10) but to latter age and at that time my problems seem to have understandable causes. Mutterings seem to be too simplistic to start any sort of dialogue with them.