I was on Cymbalta for a while for non mental health related issues (nerve pain caused by MS).

I absolutely had withdrawal when I needed to go off of it, and I can say with certainty that the mental effects of going off of it were not just the reappearance of the underlying mental health issues since there weren't any. My emotional regulation was in the toilet, I was extremely irritated, I'd cry constantly, I was horny as hell, etc.