Hi Sam
Maple Leaf has given you some good links.
Here is some more info to help explain it.
Hit a new low = the person has sunk to a lower level of feeling down, sad or depressed
Life�s been way off line - life has not been going as they would have liked it to go, usually in the negative so this person has been telling the singer that he/she has been having bad luck and sad times
I don�t need no carrying on - the singer doesn�t want to hear anymore about it, he/she has heard enough
... goes on the blink - does not work (like my brain at the moment - lol)
Cheers
Jayho