I don't know if it helps, everyone has another way to settle down:
1 Finish all the work in your real life. You know, things like throwing out your trash or paying your bills. ( I love bills
http://i1242.photobucket.com/albums/...ps847f7b73.jpg)
Just accomplish everything what may disturb your thoughts. It's hard to think about other things while the daily stuff tries to play air guitar on your nerve.
2 Listen to music, which you like, to gain a better mood. I can't show you the perfect mood song. I'm just listening to a Rock radio, and it eases my thoughts.
3. When you write something about a already existing character, you should put a peek on some of their pictures, movies or animations. Ideas may flow better when you see your protagonist in action.
4. Yeah emotions are difficult to describe: As first think, how you would react to this situation and then think how your char would react. That eases the flow effect.
5. Don't think too much about mistakes! When the thoughts flow, let them flow! Afterwards you have always time to correct it.