Hi Karim! Zak hasn't posted in a while.
Recently, I had the same experience as well, I could feel my Qi being drained from my KD-1 Point or Bubbling Springs in the bottom of my feet. The energy protection from level 2 helped me, you just put your index fingers and thumbs and call the Master's energy for protection. Dragon & Tiger Qigong and Primordial Qigong also helped me build some of the lost juice.