When unable to receive Holy Communion, it is a pious practice to make a Spiritual Communion. Say the following prayer of St. Francis:

I believe that You, O Jesus, are in the most Holy Sacrament. I love You and desire You. Come into my heart. I embrace You. Oh, never leave me. May the burning and most sweet power of Your love, O Lord Jesus Christ, I beseech You, absorb my mind that I may die through love of Your love, who were graciously pleased to die through love of my love.

Come, O blessed Savior, and nourish my soul with heavenly Food, the Food which contains every sweetness and every delight. Come, Bread of Angels, and satisfy the hunger of my soul. Come, glowing Furnace of Charity, and enkindle in my heart the flame of divine love. Come, Light of the World, and enlighten the darkness of my mind. Come, King of Kings, and make me obedient to Your Holy Will. Come, loving Savior, and make me meek and humble. Come, Friend of the Sick, and heal the infirmities of my body and the weakness of my soul. Come, Good Shepherd, my God and my All, and take me to yourself.
O most holy Mother, Mary Immaculate, prepare my heart to receive my Savior.