Firstly, I get a weird feeling, almost like the feeling when you swing on a swingset with your head tilted back all the way.
All the sudden I could feel myself start to breathe harder and my heart was beating very quickly.
Also, just in case somehow it helps.. I usually lay there for 10 or so minutes and thoughts will run rapidly through my mind and any efforts to make them stop makes it worse.
If I lay there for the 10 minutes just letting them they seem to go away and I am able to hear the ringing in my head better so I can focus on that and get to the time where my body is basically asleep.