Why do you want to throw up when you think of an old dream?

Most people do not feel as if they want to throw up when they think of an old dream. If you feel this way, that particular old dream might remind you of some traumatic event in your past. This can happen whether you are consciously aware of a past trauma or not; dreams arise from your subconscious mind, and it is your subconscious (unconscious) that causes you to feel sick.