Those are called intrusive thoughts. I had constant intrusive thoughts about gory bloody things happening to my daughter, husband, family, etc. My psych NP told me it was part of my postpartum depression. I think they can be a part of bipolar and just plain unipolar depression as well.

When I started on Zoloft (before Bipolar diagnosis) they went away immediately. I was so happy to have the thoughts gone after a whole year of the torture, that I didn't realize Zoloft isn't supposed to work so fast...LOL I got hypomanic on Zoloft. Had to go cold turkey.

Before my Lamictal got to the 100 mg per day level, the intrusive thoughts came back. You may need to go up on the Lamictal, or start another drug to control the thoughts until the Lamictal is at a high enough dose to work on its own.

Definitely bring this up with the pdoc as soon as you can. You don't deserve to be tortured by these thoughts.