Thank you to Justin Taylor for pointing to this lecture by D.A. Carson.
Last year, D.A. Carson gave a lecture in California, How Could a Good God Allow Suffering. Dr. Carson has written several dozen books, including God Who Is There: Finding Your Place in God’s Story and How Long, O Lord? Reflections on Suffering and Evil. I recommend them both.
And I recommend this lecture embedded below. But if you only have five minutes, go to the 1 hour and 27 minute mark of the video to watch his answer to this question: I’ve been living with major physical pain and I know God can heal me and His will is for me to be healed. Why won’t he or why doesn’t He?
The Works of God 
“There is healing in the last day for God’s people.” Amen! Thank you so much for sharing this.