As we have seen in the Book of Mark the reality of how Jesus the Christ went about doing good healing all that were sick and oppressed by satan.   We should also be aware that we have the privilege due to His grace to talk to God about everything (prayer) We do understand in the book of Revelation of Jesus Christ that; God hears all our prayers. See Revelation of Jesus Christ chapter 8. He does not always answer them the way we think, He does Hear them and will respond to them.. The  thing that is hard to deal with is, God uses time as a part of the healing process.