According to Duke Zhou, dreaming of cockroaches means that there is someone around you who annoys you and you can't get rid of him. You'd better find your good friend to help you find a way.
Dreaming of killing cockroaches indicates that you will be very lucky in the near future!
Cockroaches represent your troubles, and being eaten by you means that you will eventually solve your difficulties.
Of course, you can also think that this is just a dream.
I wish you happiness!