To dream that you are being injected for health reasons, suggests you need to heal your unhealthy behavior, ideas or attitudes.
This is a strong sign that you need to develop yourself on a mental and spiritual level.
To dream that someone is forcibly injecting you with a needle, represents your negative attitudes about a particular situation orperson.
It also indicates the influence of peer pressure working against you. You are recognizing that someone is forcing their negative and unwelcome views or values on you.