If the injury was physical, it is a warning that you are surrounded by hostile forces and must proceed with caution in order to expose them. If the injury was to your reputation it signifies pleasing recognition. If you were pouring ink into an inkwell it predicts unexpected travel. Good news predicted if you dreamed of being insane. If you dreamed of others being insane you will receive an unpleasant surprise.
Insects signify obstacles.
If you succeeded in killing them or getting rid of them, it signifies your difficulties will be easier to overcome. Other types of instruments such as musical instruments signify family unity and happiness. Whether you took an insult, or dished it out, it signifies loyalty from your friends and associates. If you were buying insurance, your plans for the future are secure. If the dream involved watching others, and you found it unpleasant, you are likely repressing emotional problems.