Call to Me, and I will answer you, and I will tell you great and mighty things, which you do not know. This is a very simple thought, but one that carries a tremendous truth. God wants us to call to Him. Many times He allows disappointment to rake through our lives with the intent of drawing us closer to Himself. Prayer is the most powerful tool a believer has.
Nothing compares to it.
Don't worry about what to say to the Lord. The Holy Spirit will show you. Tears are just as effective as words at times, and God is sensitive to every tear you cry. Just as He listens to the hurt you feel, He also knows how to deal with and guide you through any anger that has penetrated your life. It allows us an opportunity to tell God that we have been offended but that we are willing to give the entire matter to Him and allow Him to deal with it accordingly.