"For thus says the One who is high and lofty, who inhabits eternity, whose name is Holy: “I dwell in the high and holy place, and also with him who is of a contrite and lowly spirit, to revive the spirit of the lowly, and to revive the heart of the contrite." Isaiah 57:15
The verse above is the answer to those who are tired of asking God for something that they haven't received the answer to yet. If He dwells with the contrite, then that means that He is by your side - right there with you, who are in pain. The Lord Jesus Himself assures us that: "...whatever you ask for in prayer, believe that you have received it, and it will be yours." Mark 11:24
The secret is to believe that you have already received what you have asked for in prayer.