What does it means when you dreamed about having HIV?

Absolutely nothing.

More information:

It is very unlikely that your dream could diagnose a specific viral infection. But dreams are strongly affected by every change in the physical body, so a medical exam would not hurt, if only for your own reassurance. ... Having noted that, you might consider what HIV might represent to you. It is an infection passed through sexual activity, needle sticks, drug use, etc., and is generally associated with social stigma. Could your subconscious mind be telling you that you have deep feelings of discomfort (dis-ease) about your own behavior? Could the dream reflect feelings of guilt that you have tried to suppress, or even denial of a dangerous habit? The subconscious mind produces messages in dreams in just this way, using a scary thing like HIV to represent something else that the dreamer needs to think about. ... Another possibility could be that you subconsciously feel that you are being ostracized or shunned as if you had HIV. If that is the case, when you locate the source of those feelings, you will understand the meaning of your dream.