If you can't find the right words, you don't know what to say. Perhaps you know what you want to express; but not how you might express it. I.e., you know what you want to communicate - your experience -, but not how to model this experience, what signals to use to let others know what it is you experience. I think experiences cannot be shared; but others may imagine what you experience. In communication, it is always a faith that you understand, that you are understood. You cannot know for sure that someone else understands you exactly, you can only believe you know. In fact, you can be sure you are not understood exactly, that the other does not have the same experience you have, but a similar experience at best.