"God heals today when he wants to."
This is untrue. It is the will of God that we are always healthy and sound. God never wants us sick and there is no scripture in the Bible that even suggests that when God wants to heal anyone he does it and he does not when he doesn't want to.
Dear friend, I pray that you may prosper in every way and be in good health physically just as you are spiritually. 3 John 1:2 HCSB