Imagine two magnets being held back to back. The front of one magnet is positive, and the front of the other is negative. However, the insides of the magnets are somewhat mixed: parts of the negative magnet are within the positive and vice versa, and therefore they aren't completely attracted to eachother. They are therefore held together by an outside force. During the count to 999, these out of place parts are set free, but are not yet able to move to the correct magnet.
The negative side is held in place, attached to the positive, kept there by a higher power. After all of the out-of-place parts are set free, that higher source begins to retract its hold. When that removal is completed, the inherently negative magnet is left in darkness. Outside darkness is strengthened. Afterwards, the higher light indirectly causes light to shine on the positive side. During this time, and afterwards, the negative side receives all the negativity from the positive side, and vice versa, and they come to face each other face to face, as the attraction of the front sides is stronger than the back sides.
The positive magnet symbolizes Z"A, and the negative, the Shechinah. When the Shechinah loses its light from Chochmah, the Shechinah is in darkness, and the Sitra Achra is strengthened. Since at this time, the Shechinah is still in Galut, this is a dangerous time for Am Yisrael outside the Land of Israel, in about 3 and a half years. The light will shine down on Z"A from the side of Binah in Yovel, about 3 years later. The darkness overtakes the Shechinah in the first half of 5772, and the two sides are brought face to face in 5783, two times hinted at by the Ariza"l.
The timing of this is hinted at in a general way by the GR"A: He writes in his commentary to Sifra diTzniuta that all these developments in the upper world are hints at events throughout the course of history, and the Nesirah is in the 6th day. According to the methodology that the millennium needs to be divided in to 24 hours (the method used in Kol haTor), we are currently in the 7th hour, in which (according to most opinions) Chava is separated from Adam haRishon, the Nesirah from chapter 2 of Breishit.
This steady removal of the light of Chochmah corresponds to the darkness following the Pekidah, as taught by the Ramchal in Ma'amar haGeulah, and explains why it seems that the Six Day War seems to have been the height of Israeli history, and most everything else has been downhill afterwards. Further, it is a fulfillment of the verse in Yirmiyahu "and it is a time of trouble for Yaakov, and from it, he will be saved". For as a necessary transition to the Zechirah when we are not worthy, the darkness must come. As the darkness approaches the lands of exile, I pray that my brethren will choose to sit in the light of the palace of Hashem.