ADHD and Anxiety

I'm  years old and I am just now learning that I have had an anxiety problem my entire life.  How is that possible?  As I was reading the comics in the link below, I started to tear-up because I recognized so many of the thoughts and feelings they were depicting.  Is it really true that "knowing is half the battle"?  I guess I'll find out.

http://www.buzzfeed.com/erinchack/comics-that-capture-the-frustration-of-anxiety-disorders#.atPBAJeym