These, not prayers but Scriptures, help me:
"I can do all things through Christ Who strengthens me." Philippians 4:13
"For God has not given us a spirit of fear, but of power, and of love, and of a sound mind." 2 Timothy 1;7
"Be anxious about nothing. But, in all things, with prayer, and supplication, and thanksgiving, make your requests be made known unto God, and the peace of God that passes all understanding, will keep your hearts and minds in Christ Jesus." Phillipians 4:6-7
"Ah, Sovereign Lord,You, Who with mighty power and outstretched arms created Heaven and Earth, nothing is too hard for You." Jeremiah 32:17
I hope these help.