In trouble we sometimes ask God for help - but not neccessarily we believe that He will really help us. In fact we do many things *except for* trusting God. We do pray but we don't really expect His help. Thus we don't get it, since God won't do anything in us if we don't let Him.
We really need to know and act accordingly to our knowledge - that God knows absolutely everything. He knows our troubles, He knows our pains, He knows what we want to tell Him or what we want to ask from Him before we even think about that. He doesn't forget, He never is busy in such a way so that we would hear: "Later". He just IS and knows all!
Since God is love, we can and should trust, that He wants to help us, that He is interested in our business. He is eager to help us in everything towards our salvation. We just need to let Him!
Therefore, while praying we should think about God, not about our problems. He knows about them and wants to help us. We just need to trust Him, throw ourselves into His hands. With this true miracles can happen since we will give God freedom (not that He really needs it - He just respects our free will) to do whatever's neccessary in our lives.