physical healing is not a material thing. look at John 14:13,14 1st John 5;14,15. Healing is in God's name. but God doesn't always choose to heal. i'm sure, all of us Christians can come up with something they don't like about (i'm not saying disagreeing), God's working with us. i'll give you 1: none of us "like" that kids are bon handicapped. back to healing, for me, that's the #1 issue i don't like. imagine a Christian asking God for physical healing 40 or 50 years & doesn't receive it!
I believe that God has a plan and purpose for each one of our lives. Our lives compared to eternity means a lot to us and we yearn for comfort, security, good health, good friends, respect, and love ones. Obviously, everyone is born in their own unique situation. What does our lifetime mean to an eternal God? God is letting humanity play out in a history that He already has mapped out and oversees. In this history, all of humanity is condemned because of Adam and Eve's eating from the fruit of the knowledge of good and evil. Where there is no law, there is no transgression. This knowledge of good and evil is our conscience and is considered as a law. We are all born under the law because we are all born with this knowledge. We all fail because our motivation in life from birth is self. Jesus explained that the greatest commandment is to love God first with all of the mind, heart, and spirit. The second greatest is to love everyone else as you love yourself. Jesus perfects us by filling us with the Father and His Holy Spirit. They fill our hearts with love, and change our motivation from love of self to love for God first and everyone else second. They also affect our thoughts and actions when we walk in the Spirit and give us understanding and strength to persevere. That happens when we are beset by misfortune and know that God is in control of everything and there is a reason for everything that happens in our lives. Our lives are short compared to eternity, but they determine how we are going to spend eternity. For this reason the early Christians persevered when persecuted. I'm sure that they prayed as well for change in their circumstances but their prayers were for strength to persevere in their time of testing. If you think that you can change your circumstances, then go ahead and try. If you cannot, then accept it as God's will and know that God is in charge and will reward those that persevere.