line break after the second Deus Meus adiuva me, Bill. You already have four of the verses translated into modern Irish, if you count the verse Annraoi added when he corrected my mis-spellings. Did you not see the link to CELT on the earlier thread?
I only know modern Irish but I would be fairly sure from the pattern of the first verse that "Tuc dam co trén" = "Tabhair dom go tréan". "do sherc dam tall" might be "do shearc dom thall".
You'll need to go to an Irish mass; you've a chance of hearing this song.