Eastern Orthodox Christianity: Prayers and Hymns in Time of Trouble, Need, Influence, the Unknown:

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Prayer in Time of Trouble~~
Lord of the Powers be with us, for in times of distress we have no other help but You.
Lord of the Powers, have mercy on us

Prayer In Time of Need~~
Almighty God, the Father of mercies and God of all comfort, come to my help and deliver me from this difficulty that besets me. I believe Lord, that all trials of life are under Your care and that all things work for the good of those who love You. Take away from me fear, anxiety and distress. Help me to face and endure my difficulty with faith, courage and wisdom. Grant that this trial may bring me closer to You for You are my rock and refuge, my comfort and hope, my delight and joy. I trust in Your love and compassion. Blessed is Your name, Father, Son and Holy Spirit, now and forever. Amen.

O God, our help in time of need, Who are just and merciful, and Who inclines to the supplications of His people. Look down upon me and have mercy on me and deliver me from the trouble that now besets me. Deal with us not according to our iniquities, but according to Your manifold mercies, for we are the works of Your hands, and You know our weaknesses. I pray to you to grant me Your divine helping grace, and endow me with patience and strength to endure my hardships with complete submission to Your Will. Only You know our misery and sufferings, and to You, our only hope and refuge, I flee for relief and comfort, trusting in Your infinite love and compassion, that in due time, when You know best, You will deliver me from this trouble, and turn my distress into comfort. We then shall rejoice in Your mercy, and exalt and praise Your Holy Name, O Father, Son and Holy Spirit, both now and forever and to the ages of ages. Amen

Prayer Against Demonic Influence~~
Almighty God, Who delivered Your people from the bondage of the adversary, and through Your Son cast down Satan like lightning, deliver me also from every influence of unclean spirits. Command Satan to depart far from me by the power of Your only begotten Son. Rescue me from demonic imaginings and darkness. Fill me with the light of the Holy Spirit that I may be guarded against all snares of crafty demons. Grant that an angel will always go before me and lead me to the path of righteousness all the days of my life, to the honor of Your glorious Name, Father, Son and Holy Spirit, now and forever. Amen.

Prayer Toward the Unknown~~
O Lord, You who steadied the hand of Peter as he began to sink on the stormy sea, if you are with me, no one is against me. Grant to me the shield of faith and the mighty armor of the Holy Spirit to protect me and guide me to do Your will. The future I put into Your hands, O Lord, and I follow You to a life in Christ. Amen