Yes. I used to have mental breakdowns and freakouts as a kid. My mom just wrote it off as me being an irrational, fearful child, but I knew there was something wrong with when I was about 11. I had these uncontrollable thoughts about all the ways I was going to die. Bombs, people breaking in, heart attack, etc etc. As I got older, it got worse and worse, and whenever I was in a high anxiety situation, I'd get dizzy and faint. My doctor said it was low blood pressure, but it wasn't until I got a therapist this year (I am 18) that I discovered that everything, my freakouts, my panic attacks, my sugar cravings, my hyopochondriac reactions, my dizziness and fainting, it was all related to GAD. I just thought I was crazy, my entire life I thought I was just insane and that there was no hope.
Though knowing that I have GAD doesn't make the situation any better. at least knowing that I have a sickness and not that I am batshit crazy really is helpful. It also allows me to learn what my triggers are.