When should we pray for healing and wait for God's response and when should we go visit a doctor? How can we know which is the right decision at a given moment? I understand that God can use doctors as instruments to heal people, but miraculous healings without medical intervention are also within the realm of possibility. Is there a way to know what God's will is in each specific situation?
I have seen people healed by prayer alone, and I have seen people who after prayer still needed to see a doctor.
I myself currently have some quite serious bowel problems, that may need a big operation to fix in the natural. I daily pray that God heals me, but this does not stop me from visiting the hospital for checkups, or for treatment if God chooses not to heal me.
God does not always heal, Elisha one of the prophets of God fell sick and died of the sickness.
2Ki 13:14 Now Elisha was fallen sick of his sickness whereof he died.
Sickness is not a sign of weakness, note the following that occurred when Elisha died.
2Ki 13:20-21 And Elisha died, and they buried him. And the bands of the Moabites invaded the land at the coming in of the year. And it came to pass, as they were burying a man, that, behold, they spied a band of men; and they cast the man into the sepulchre of Elisha: and when the man was let down, and touched the bones of Elisha, he revived, and stood up on his feet.
He was so in touch with God's Spirit when he died that a man revived who was thrown into Elisha's grave.
Ultimately God determines who gets well from prayer. It does happen, and I pray for it often because healing is a New Covenant promise, God has promised it as a gift to the church. But even then, who can do it, and when is up to God.
1Co 12:28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
Just remember:
Mat 21:21 Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.