I think this is definitely part of anxiety. I also have also had this issue in the past.
The memories for me came with a feeling of deja-vu and also would cause my anxiety go to 0 to 10 real quick as they had a creepy feel to them or something about them didn't seem right.
Like you said they were insignificant memories or memories that may not have even happened.
I think what makes them stick around or happen more frequently is that 'knee jerk' reaction you give them. I treated them the same as I would an intrusive thought and slowly it went away.
The memories for me came with a feeling of deja-vu and also would cause my anxiety go to 0 to 10 real quick as they had a creepy feel to them or something about them didn't seem right.
Like you said they were insignificant memories or memories that may not have even happened.
I think what makes them stick around or happen more frequently is that 'knee jerk' reaction you give them. I treated them the same as I would an intrusive thought and slowly it went away.