Hey danigirl
I am still in my youth and have recently developed this feeling. It keeps me up at night and after a while, all the saliva in my stomach makes me queasy. How do you deel with it? Its torture I cannot go back to sleep for a while once it starts and some times it continues into the day.
But I found a way to stop it. Durring the day, it's not such a big problem. Just don't sit there and do nothing. Focus your attention on something else. But a night, when you feel you need to stay up and read or something, dont. Just go back to bed and day-dream. But get into it. really get into your dream and you will go to sleep and the feeling will go away. Jolt out of the dream and it will come back. Fast.
hope i was some help
-jenjen2000