To dream of cockroaches represents feelings of undesirability. Something you really don’t want in your life. (e.g. the feeling you’d get from a bad haircut.) Feelings about a situation being low quality, dirty, or poor. A tarnished reputation. A continuous problem. Feeling annoyed by something subpar. Imperfections that embarrass you.
Example: A young man dreamed of being surrounded by cockroaches. In real life he met an old friend who expressed love to him. He was extremely uncomfortable with this expression of love. The reflected how undesirable it was to have this friend be so honest with him about his feelings.
Example 2: A young man dreamed of using insecticide . In waking life he was trying to repair an old friendship that had a lot of bad memories and misunderstandings that got in the way.