Prayer to St. Jude:
Here's his prayer
O most holy apostle, Saint Jude, faithful servant and friend of Jesus, the Church honoureth and invoketh thee universally, as the patron of hopeless cases, and of things almost despaired of.
Pray for me, who am so miserable. Make use, I implore thee, of that particular privilege accorded to thee, to bring visible and speedy help where help was almost despaired of.
Come to mine assistance in this great need, that I may receive the consolation and succor of Heaven in all my necessities, tribulations, and sufferings, particularly (here make your request) and that I may praise God with thee and all the elect throughout eternity.
I promise thee, O blessed Jude, to be ever mindful of this great favour, to always honour thee as my special and powerful patron, and to gratefully encourage devotion to thee.
Prayer to St. Michael, if something other than yourself is bringing you to ruin. Here is his prayer (short version). I've changed it slightly to be more encompassing.
Saint Michael the Archangel, defend us in battle, be our protection against the malice and snares of the devil. May God rebuke him we humbly pray; and do thou, O Prince of the Heavenly host, by the power of God, thrust into hell Satan and all which is in the world for the ruin of souls. Amen.
Finally, give yourself to Jesus, which simply means gives yourself over to being saved (from despair and ruin, yes, but whatever more).
Here's a Jesus prayer my minister taught us:
"Lord, make haste to help me. Lord make speed to save me."