Dreaming about cockroaches is not only unpleasant, but implies various risks and nervous diseases. Dreaming about a few cockroaches, hints that the dreamer will soon go through moments of shame and sadness. When there are many cockroaches it indicates that something serious is about to happen and the dreamer must be prepared, and must exercise self-control. Dreaming of crushing and killing one or more cockroaches and having them leave water instead of blood announces a prolonged illness. Dreaming of roaches climbing on a white wall and having hot water thrown at them, hints that the dreamer feels powerless against the disease that afflicts him. If the water thrown kills the roaches, there are many possibilities of relief, however, if the roaches are still alive and climbing the wall, the disease will follow its normal course.
Dream dictionary: Cockroaches dream meanings
If they have bad intentions towards us, then it indicates slander, intrigue and suspicion. Catching them or killing them, you will dominate over your opponents.
…To dream of black beetles signifies impending illness, sometimes serious, sometimes slight. Before being laid up with bronchial colds, I very often have very harrowing dreams of being visited by shoals of black beetles and cockroaches….