Hi all, have been having this for almost 4 years, 24/7.

Basically, the last song which I heard, a snippet of it will constantly play inside my head. It started after having been stressed for 4 months during a period where I lost a lot of money, plus covid, plus work issues etc. The stress triggered the condition at age 29. Insomnia followed, not because of the song but because of the stress which the intrusive, repetitive song caused. The foundation of this phenomena according to my research is : repetitive intrusive thoughts or if we gonna use the medical jargon: Involuntary musical imagery (INMI)

I've always had some anxiety as a little kid, intrusive thoughts etc. But never thought much of it, it was my normal. I'm also highly neurotic by nature, perfectionist, workaholic etc.

The song gets loud during stressful periods, it's always there but the volume adjusts according to stress levels.
A lot of forums says this is OCD. A subset known as schiz ocd. This has nothing to do with psychotic disorders though. Dopamine inhibitors in the majority of cases should not be prescribed. At least not as a first line of treatment. For some it's related to their ADHD, others autism. There are many conditions which can exhibit this symptom.

There are few articles on pubmed which analyse this condition. Again, based on those articles, everything comes down to OCD.

Reference:
-https://pubmed.ncbi.nlm.nih.gov/30401794/
-https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5461857/
-https://pubmed.ncbi.nlm.nih.gov/33750381/
-https://journals.lww.com/aips/fulltext/2019/03020/musical_obsessions__successful_treatment_with_low.19.aspx

Also, there a lot of posts on Reddit discussing this phenomena under: OCD, Anxiety, Adhd, DR/DP, Bipolar and similar mental illness subs.

The mission is to decrease stress, not directly treat the symptom. Drugs plus therapy is advised in severe occasions. I myself have not started medication but am considering it in the near future.

Medication which have resolved some peoples case were: fluoxetine, sertraline, escitalopram, aripiprazole. Again, the reason why different people respond to different medication is probably because of the underlying condition. Therapy is also advised.