"You anoint my head with oil"
Sheep often happens to have their heads trapped with brambles and die trying to untangle.
There are also small flies that like to disturb the sheep by laying their eggs in their nostrils. These become worms and force the sheep to bang their head against a rock seeking to get rid of that discomfort, sometimes to death.
Your ears and eyes are also susceptible to other insects that torment them.
Then, the pastor anoints his entire head with oil. In this way, they can be at peace. This oil forms a barrier of protection against those evils that threaten the sheep.
Do you have moments of mental torment? Or worrisome thoughts that invade your mind over and over again? Do you bang your head against a wall trying to stop them? Have you ever asked God to anoint your head with oil?