I don't see the point in writing down a phonetic spelling of it because it would only be approximate, but I'll do it anyway. If you can find someone to say it for you then that might be easier. Try faxing it to a GAelic organisation or college and get a native speaker from there to recite it over the phone.
http://www.smo.uhi.ac.uk
"Dhutsa mo chridhe agus m' anam gum bitheadh sinn gu brath suainte ri cheile"
The "dh" of Dhutsa is pronounced at the back of the throat,(a kind of garbled "g"-sound), ch in "chridhe" pronounced as in German ch or Scottish "Loch". The "t" in "suainte" is pronounced "ch" as in English "church". The "th" in "brath" is silent.
Ghootsuh mo (as in low) chreeyuh ugus mannam goom bigh sheen goo braa sooantchuh ree chyayluh.
Tha mi an dochas gu bheil seo feumail dhut. I hope this is helpful to you.