This may be a carry-over from your daily life. In our dreams we can experience and express such feelings safely. Feeling great anger in your dream may be disturbing but pay attention to it and attempt to deal with all of your emotions in a more appropriate and productive manner. Also, you could be being warned to release your anger in a positive manner. If you are not aware that you have anger, this dream is warning you of its hidden power. Anger is just another pattern to be dealt with.