Trust, does God have you in the palm of His hands, like I feel He does me?
Pain will come and go because of the lack-luster love in this world if our focus is on this world. If we focus on God and His love, we find we are healed by the power of that love. Nothing can separate us from the love of God and Truth when we know Him.
Pain can also come from the consequences of sin in our lives or due to other peoples sins that effect us in some way. Jesus takes away the spiritual stain of sin on our lives but in the physical, we many times have evidence or reminders of sins of long ago that leave a scar for all to see. Here is where we must let the love of God fill us so we have a sense of our great worth. How great a calling it is to be a son or daughter of the Creator of the Universe.
Just like Jesus wears the scars of the sins of the world on His body, we too sometimes have the battle scars of the world and sin on us. Nothing is impossible when we are in the hands of the Almighty God.