Prayer is the secret weapon of the believer if done so from the proper perspective. If you pray "if it be thy will" prayers, I wouldn't expect much to happen. But if you stand in your identity and authority in Christ, you can expect to see everything Jesus paid for manifest in your life and the life of others.
You don't have to ask God to give you things he's already given you in Christ. In Christ, you have been delivered from the power of darkness and translated into the kingdom of Jesus. Jesus bore your sickness and disease on the cross. He delivered you from the wrath of God. You have the mind of Christ so that you can have peaceful mental health. God promised to meet your needs exceedingly, abundantly above all that you can ask or imagine. His spirit is in you, guiding you into all truth. He gives you wisdom just by asking. He has given you power to minister to others.