Yes you are experiencing high anxiety and paranoia. You've had 3 tests and all were negative. You are not infected.
Bear in mind that medical professionals have EVERY reason to notify someone when they have an STD from a professional, ethical, legal and public health standpoint. And they will certainly do so to prevent someone who actually is HIV positive from inadvertently infecting others.
If you had it, they would certainly tell you.
You have nothing to worry about. AIDS isn't some kind of divine punishment for bad behavior. It's a pathogen. That said, if the possible consequences of your actions have you this upset you may want to evaluate your behavior and moderate the risk accordingly.