Memories of my childhood are coming back now.... I also remember "Lord I am not worthy to receive you under my roof, but only say the word and my soul will be healed." Did you have to say that 3 times? That part I don't remember.
At what point did they stop saying "and with your spirit?" I remember that too, but from a very long time ago.
Below is when the Priest holds up the Host either over the Chalice or Paten. One line is Latin with the English under it.
Communion of the Faithful
The Priest holds the Host for all to adore.
P: Ecce Agnus Dei, ecce qui tollit peccata mundi.
P: Behold the Lamb of God, behold Him who takes away the sins of the world.
R: Domine, non sum dignus, ut intres sub tectum meum: sed tantum dic verbo, et sanabitur anima mea. (3 times)
R: Lord, I am not worthy that Thou should come under my roof. But only say the word and my soul will be healed. (3 times)