Use ordinary language and keep it simple - imagine you are speaking to a friend. "Lord help me, now", or "give me strength to keep going" is quite enough.
Use the Bible, perhaps the psalms, to show you how others prayed.
Use your whole body when you urgently need to pray, perhaps go for a walk, or look at something that inspires you, and just let the urgent words come.
Use words aloud, whisper or shout, it doesn't matter, just use your voice.
Get into the habit of turning to God before things go wrong.