Many people are understandably concerned about contracting HIV -- but that worry can become overwhelming. While some worry after specific sexual acts or due to the risks from partners with known or unknown HIV status, others find themselves consumed by fears that may be stronger than the facts of HIV transmission. They ask: Should I worry after protected sex with a sex worker? It's been a few weeks since I had sex and I have a lot of symptoms; are they due to HIV or anxiety? I tested negative but does that mean I really don't have HIV?