I had a similar side effect with respirdol and abilify.

Did you and your pdoc discuss your concern about the intrusive thoughts?

One non-med idea is to try a puzzle of some sort. I specifically like Sudoku as solutions are heavily based on logic and pattern recognition. This takes some concentration so I can croud out some of the intrusive thoughts. I also like putting together picture puzzles...

Do you have any activities you enjoy doing that can help crowd out the other thoughts?