These are good questions sir. Supposedly, it is mostly through childhood (rather than genetics) that somebody acquires the predisposition to anxiety and depression. Physical punishment, for instance, is tied to anxiety in some studies. Mild dissociative disorders are supposed to be tied to emotional abuse. Emotional abuse from childhood may be hard to detect for the person trying to remember, so it's hard to say "that doesn't apply to me."
I do believe everyone who has generalized anxiety can be "fully recovered." Maybe I'm missing some special case, but I don't think so. I know 8 or more people personally who have anxiety and/or panic disorder. I've talked to many people one on one online as well, more so in other forums than this one. I have noticed that those who haven't recovered yet have something in common in that they are cynical about their illness and life in general. I think being optimistic is a really key thing. It's hard to be when you've "let yourself down" so many times, but according to (for instance) Weekes, it doesn't matter how long you've had it or how intensely or how many times you've "relapsed," full recovery is waiting around the corner with the right information.
As to what I do, there's a lot to it, but it's also very simple. First I'll tell you what I don't do. I don't let anxiety dictate my diet, if I feel like eating sugar, caffeine, etc, I will. Meditation helped to calm me down from a bad state, but I don't meditate anymore. I try not to do anything to "fight" the anxiety. Claire Weekes says to face the situation, accept the feelings, float through the anxiety, and let time pass. There's a lot more to it than that, but that's the basis of it. If you really believed what I just said, then that's all you'd need to know. But most don't really have confidence, or faith, in it, so most of the struggle is really convincing yourself that it is worth a try.
If I knew more about the nature of your anxiety, I'd be able to elaborate better. Otherwise I'm afraid I might ramble on about things that are irrelevant to your own anxiety.