Panicky

I am close to hyperventilating here! I haven't got any idea on how to provide a melody on tomorrow's responsorial psalm! I'm not in the mood to make music right now but I don't have any choice but to squeeze notes and tunes out of my brain or else, the psalmist will end up reading tomorrow psalm.... I wish this is just as easy as one, two, three but its not... I have to produce a melody that is liturgical and would most likely fit with tomorrow mood and tone! How could I possibly do that?....