To dream of vomiting represents rejection of certain beliefs, ideas, or feelings. Often a sign that one is reversing their views about negative thinking patterns, situations, or relationships. A reversal of your preconceived ideas. Feeling embarrassed about having to change your beliefs, values, or feelings about a shocking situation.
Vomiting may also indicate a wish to change your life in some way. A situation or relationship may be unsettling to you or no longer of any interest to you. Not feeling good maintaining certain lifestyle choices or behaviors.
To dream of trying to prevent yourself from vomiting represents an emotional attempt to hold back on rejecting certain beliefs, ideas, or feelings. Not wanting to embarrass yourself in front of others rejecting something publicly. Not wanting to look like you are reversing yourself or rejecting something in front of others. A preference to talk about rejection without actually wanting to. Feeling that people will not respect you if you reject something out in the open.
Example: A man dreamed of seeing someone he knew vomiting. In waking life he was rejecting a lot of negative past behavior. He felt bad about his past and began to apologize for it.