Well it could just be that all that moving your tongue around strengthened your tongue (a big muscle, remember) and made it flexible enough to reach back there. I relaly don't think it's a huge problem. Maybe just a cool trick
Sometimes food gets stuck in the tonsils or back of the throat, and I usually have to stick a toothbrush back there to get it out. Sounds to me like you're just ahead of the game.
On another note, though.. . you might want to get that anxiety taken care of

Have you seen anyone about it?