Lack of motivation/Expression

Does anyone feel like its very difficult to express them selves or even write an email? I have been struggling with this for awhile and many times I want write a topic on the message board but three words in or so I just close the window because I have such a lack of motivation right now. I see a lot of topics where people mention that they have a blank mind but they are able to write paragraphs explaining their symptoms or writing a response to someone else's post. How can your mind be blank when you can write such a concise response. Am I alone here? I have so much difficulty communicating these days.