Is this really anxiety? Sleep Issues

The issues I'm having (and most of the stuff I've read) seem to easily surpass "actual" disorders. I feel like punching someone in the face when they say it's JUST anxiety because it drives me to $#%^ day and night, every second. My chest, body, everything has suffered. I wasn't born with this, it began when I hit a certain age along with severe confidence issues and a constant sense of fear which can end any concept of security. It literally destroys my mind. This can't be just anxiety, there has to be something more. Has anyone ever felt this way? I get so angry thinking that all this suffering is just an overactive survival mechanism, and not some sort of severe psychosis or some benign growth in my brain that's irremovable and unchanging. I'm a fairly atheistic person but I sometimes feel that the universe is hell, designed to make us question it's pointless existence forever, and I'm just going to suffer forever, even after death somehow.

I'm wondering if this is really anxiety. This is more severe and debilitating than most other illness I've seen. Even my friends with low functioning down syndrome can get a job and function with help, I can't even do that. They are happy often, relaxed at other times, they don't care what people say. A single insult is like a blade that I can't remove for me. It's as if the only true fix is total and complete isolation, which it probably is. I'm extremely tired but going to sleep just has me lying in bed for hours, burning up and breathing like I've been running a repeating marathon the entire day. I'm totally unable to sleep, think, eat, breath. The only thing I can truly do is just experience. No matter what I do, where I go, what I think, it's always there. This horrible disgusting feeling of hell and this knowledge of destruction everywhere that kills me gradually. I even know what gene is responsible, just not how to eliminate it (and get rid of a bunch of brain functions at the same time). Nature is terrible and inefficient. What kind of survival mechanism is this? I can barely live let alone adapt. The "Just anxiety" pisses me off to no end.