Majed Mahmoud has a talk in which he mentions something that the Prophet (PBUH) used to say.
I would like it if somebody can provide a translation and transliteration of this please.
Just as asyncBoy has said, praise to Allah in any case.
There's a similar saying in Arabic: نحمده علی بلائه کما نحمده علی الائه
praise to Allah for his tests (struggles we go through) just as we praise Allah in his blessings.
When you're child is sick, praise the lord the he's just not sicker, that he's a Muslim, praise the lord that you're at least married and with child (many don't get married, many are divorce, many can't have children, many have dead children, etc.)
When you have a bad spouse, still praise the lord for all the good things you were able to achieve because of this spouse...you were able to have amazing children you will able to pious, enjoy a bed together, your sustenance was increased together...