There is grief, and then there is grief.
Grieving is a natural response when you lose someone. However, you can acquire the Spirit of grief, which can cause you to be so overwhelmed that you cannot function.
“My soul is weary with sorrow; strengthen me according to your word.” Psalm 119:28
God’s word is your strength and can pull you out of this state.
God provides “…beauty for ashes, The oil of joy for mourning, The garment of praise for the spirit of heaviness; That they may be called trees of righteousness, The planting of the LORD, that He may be glorified.” Isaiah 61:3 and “He heals the brokenhearted and binds up their wounds.” Psaalm 147:3