Can anxiety or severe anxiety directly kill you physically without horrible medicine?

What about severe social anxiety? Does that directly kill you? I have had these for 12 years when I first got anxiety when my aunt died. 

Is there anything at walmart that works wonders that causes no harmful side effects or no health problems?

I'm 33 years old,healthy not a single health condition my doctor can find. 

But how would anxiety directly kill you physically? This is what I have been told.