Hello everybody. I'm writing from Italy and hope you will excuse me if I make some mistake in writing here.

I've just known this wonderful song and... could anyone tell me what's the meaning of these verses (and the correct spelling, if possible)?

chorus: Siúl,Siúl,Siúl a ghrá
Níl leigheas ar fáil ach leigheas an bháis
Ó d'fhag tú mise is bocht mo chás
Is go dté tú mo mhúirnín slán

Many thanks