When you are angry with God...

If you hold back from releasing frustration and anger to the Lord, you will punish other human beings for what has come to you by God's hand. Be respectful and remember that you address the Almighty God, but do share your heartache with Him. 

Do not repress the Holy Spirit within.  Silencing God's voice will magnify your sense of grief and longing many times over. Let the Spirit flow and be comforted. 

You may desire to hurt Him for what He has allowed you to suffer, but your efforts will not succeed.  Jesus suffered once for the entirety of human grief and sin that will occur to the end of time. Therefore He has already  weathered the blows of your heartache and anger and gained victory over them by His suffering.  You can choose to participate in His victory.

Although in one mood you may feel vindictive toward your Creator, in another you may actually fear that your expressions of anguish or anger will hurt Him.  Again, remember the price for your pain has already been paid; rest in the understanding that the travail of the Cross is finished. You do not cause additional sorrow for Christ by partaking of the forgiveness and healing His suffering purchased. The opposite is true; your comfort is His consolation.   

You don't need to forgive Him, you need to trust Him. Let Him search your heart. Confess if you have sinned in response to the blow you have received.  Pour out your hurt to Him. Partake of His peace, place your trust in Him, and rest.