GOD says 'Do not worry about tomorrow' [Matthew 6.34] because HE designs it and 'Do not worry about anything' [Philippians 4.6] because HE is able and HE says 'If you are willing and obedient you will eat the BEST of the land [Isaiah 1.19] because HE decides it. So just believe and obey GOD/BIBLE remaining calm and confident in HIM never letting your sadness of the past or uncertainty of your future to ruin your present Happiness because GOD cannot lie [Titus 1.2] GOD cannot change [Malachi 3.6] Beloved Nothing is impossible with GOD [Luke 1.37] just trust HIM and in HIS Word/BIBLE.