Tinker, try not to self analyse as you will go around and around in ever decreasing circles, which adds to the anxiety. Don't beat yourself up , this condition has no discrimination, it creeps up and gets the old, young , ill healthy, poor rich, idle, busy , men ( not so many ) women, it can just come. Just keep reminding yourself every time it strikes, that it WILL pass and you WILL be ok. Great big hugs from me xxxxx