Here is a wonderful mantra. It is called Maha Mrityunjaya Mantra or also Trayambakam Mantra. It is already on this blog in a video explaination on a post from last year. You can find it in the archives.
urvārukam iva bandhanān
mrtyor mukshīya māmrtātat
Translation (by Arthur Berriedale Keith)
"OM. We worship and adore you, O three-eyed one, O Shiva. You are sweet gladness, the fragrance of life, who nourishes us, restores our health, and causes us to thrive. As, in due time, the stem of the cucumber weakens, and the gourd is freed from the vine, so free us from attachment and death, and do not withhold immortality."
tri-ambaka-m "the three-eyed-one" (accusative)
yaja-mahe "we praise" (1st pl. middle)
sugandhi-m "the fragrant" (accusative)
pusti-vardhana-m "the prosperity-increaser" (accusative)
urvaruka-m "disease, attachment, obstacles in life, and resulting depression" (accusative)
bandhanāt "from attachment stem (of the gourd); but more generally, unhealthy attachment" ("from the stem", ablative)
mrtyos "from death" (ablative)
mukshīya "may you liberate"
amrtāt from immortality (ablative)
om tat sat