Here is a Prayer to be united with Jesus when you cannot receive the Eucharist. Pray earnestly that Jesus comes into your heart and fills you with his Holy Spirit.
My Jesus, I believe that You are present in the Most Holy Sacrament.
I love You above all things, and I desire to receive You into my soul.
Since I cannot at this moment receive You sacramentally, come at least spiritually into my heart.
I embrace You as if You were already there and unite myself wholly to You. Never permit me to be separated from You.