The first grace of this sacrament is one of strengthening, peace and courage to overcome the difficulties that go with the condition of serious illness or the frailty of old age. This grace is a gift of the Holy Spirit, who renews trust and faith in God and strengthens against the temptations of the evil one, the temptation to discouragement and anguish in the face of death. This assistance from the Lord by the power of his Spirit is meant to lead the sick person to healing of the soul, but also of the body if such is God's will. Furthermore, "if he has committed sins, he will be forgiven."CCC 1520
I have received the sacrament twice. Both times at the beginning of real bad bouts of OCD/Depression. Both times I have received renewed strenght, hope and relief from my pain. When your spiritual father marks your hands and forehead with the blessed oil you feel the hand of Christ touching your hands and your forehead.
Your tears mix with the oil. Your heart with His Sacred Heart and somehow, through His grace, the Holy Spirit rushes into your heart and mind and you can rest.
So, if necessary, go to your priest and request the anointing. Christ created it having you in mind. He wants to bring rest and relief to you. In the Sacrament of the Sick He is there, ready to embrace you.