consider this: GTD is there to help you for years to come. You'll see many jobs, probably. You'll experience fun, crisis, doubt, whatever - and GTD is by your side. It's just a tool that helps you, especially when your mind just can't focus. Like an autopilot.
Since you're investigating new options for your career, it should be obvious that your current job doesn't satisfy you. So what. Use GTD to make sure this feeling doesn't hurt your work performance too badly. Use your remaining time to make your employer and colleagues wish you wouldn't leave.
With respect to the next step after awareness: talk to those who know you well. Get a grasp on your old dreams. Re-experience, in your mind, similar situations in your career - the doubts, the fears, and how they vanished once you had made a decision.
Whatever you do, don't expect miracles from your personal organization system but don't give it up, either. Treat GTD like your car.