that's good you're not as agitated as usual by them. there may be no traumatic thing. maybe a thing that developed during depression, i get suicidal fantasies & it can become a habit. like it's my "go-to place" in my head.
in mindfulness, you'd just sort of observe the thought without judging it, let it slip away and have another thought.
my bad intrusive thought over the years, is slicing my left arm open. hope it's ok for me to say that - there is already trigger icon on here :/
the start of this thought was trauma, my son was threatening to do this and then he did but he was ok (ok as in alive). this was about 5 years ago, i worked really hard to get through that intrusive thought. But 2 months ago his little gf who I love & has been with us for 2 years, cut her arm like this in my kitchen. she's ok but with a lot of stitches. So the intrusive thoughts came back of that same scene. it sucks so bad
i do energy & chakra work, the violet flame meditation helped me before with this one. I let the intrusive thought happen, but I turn the knife into violet flame so when in imagining it go through my arm, it dissipates the negativity.
i also had a lot of paranoia with this recent episode, thhinking i'm hexed etc, so the calming meds helped for sure.