You want to know what they are or how they work?
Basically, stress symptoms arise when there is an overage of stress hormones in the body. That's a very simplistic version, but that's basically all that's happening. It stems from the flight or fight response—in that mode, the heart rate and respiration increase, digestion slows, we might sweat, muscles tense, etc. The body doesn't know how to differentiate though between a real threat or an imagined one. That's why you get nervous waiting to give a speech (for example). You might be being chased by a lion or anything, but your body is still responding to the feeling of fear/apprehension/danger.
Usually, when the threat is gone (the lion got distracted by a baboon, the speech is over), stress levels come back to normal. The problem arises when the threat doesn't go away, or when we believe it not to go away. That's what an anxiety disorder is—it is the fearful overreaction to largely imagined stressors.
We hypochondriacs have this problem. Our stress hormones become elevated for whatever reason and we become symptomatic (and there are literally hundreds of stress symptoms). The thing we feel in our bodies—the numbness, the tingling, the extra heartbeats, the pain, the constipation—SCARE us, so we do what we think will help and jump on the internet to make sure that what we're experiencing isn't dangerous. But what we read on the internet scares us even more, and the body reacts to the fear by creating even MORE stress symptoms and then we interpret those symptoms incorrectly, usually as our disease du jour, and get scared, and become more symptomatic. And then we end up at the doctor's office or ER convinced we're about to die, when really, we're not.
That's the basic concept behind stress and its bodily symptoms. A reduction of symptoms will only come with a reduction of stress.
I'm curious as to why you feel like the burning feeling in your arms and legs points to HIV (have you had unprotected sex with an infected individual?). And I bet that when you do go to the doctor, they will probably tell you you're suffering from anxiety.