When I pray the 3rd Sorrowful Mystery, I always meditate on two particularly unique forms of suffering. First, as another poster said, a huge part of this torture was that he was humiliated and mocked - it was very psychological. But for me, the part that really sticks out is that it is the one part of the passion where he has no one near him that has any affection for him at all. At the agony in the garden, he did have his three disciples even if they were asleep. At the scourging, it was most probably public, so even if he could not see his friends and mother, they were most probably near. And during the carrying of the cross and the crucifixion, he had his mother near.
But for those moments during the “crown of thorns”, he was humiliated, he was spat upon and hit with a reed and crowned with thorns, he had a heavy robe put on his bloody, scourged body, and he was waiting with dread at the tortures to come when it was time for the crucifixion. The worst part of the whole thing for me, however, is the fact that he was totally and completely alone.
St. Francis de Sales says to find a moment to dwell with Christ, and for me, this mystery is the moment. When I’m feeling down, dejected, alone, humiliated, or anxious, I just go to that place in my mind, and sit with Christ. We sit there alone, together. It gives me great comfort.