Clay is used to take a mold of a good tab. This good tab mold is fit to the broken tab, then filled with ABS cement. The tab is rough, and not exactly perfect. However, it is a full plastic repair of the missing section, and a great improvement over what was there.
The real reason we are feeling so run down is lack of nutrients in our soils. Even eating exceptionally well, we will still run short. Its a sad fact, but true. To cover those daily needs the best nutritionals out there can be found at http://healthforthesoul.youngevity.com/ My recommendation is the healthy start pack for your basics.
Crash The main reason has to do with the crash you feel after your adrenaline runs out. Anxiety is like being on high alert. Your body is preparing you as though you're about to get ready for a fight, and so it floods with energy in order to get you ready to attack and run from anything coming at you. Of course, nothing comes at you, and when that adrenaline runs out your body goes through a crash that can cause severe fatigue and tiredness.