The believers' Faith can be tried. There is something called the trial of faith, but you must possess faith before your faith can be tried. The moment we believed, we received faith in Jesus as saviour and Lord. A believer's faith is not genuine and strong until it is tried. Whatever you are passing through now could be a proof of your faith.
1 Peter 1:7 - That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ
That situation your are in now is just for a moment. Anytime God allows trials to come your way, it is to train you in order to move your mountain. Genuine faith will always stand every trial. Between the time you believed God and prayed for something, and the time it manifested physically is called the trial of faith. Most believers give up during this process.
Genuine faith believes that God has done it even while you have not seen it. God is faithful and His faithfulness can be proven. So stop complaining and start believing.