I have had a lot of intrusive thoughts just like that before, I haven't acted on them but I'm really quiet, anger issues maybe? Like pent up anger from a source, maybe money as it gets you down and is put of your control and it builds up so it's kind of like a psychosis.. I guess tell your doctor, I never did because I didn't want to tell people in case it was like schizophrenia or something but I think it's better to know so that it can be helped I guess