I wrote to the RNID (Royal Institute for the Deaf) about my problem with
tinnitus and received this reply which I found very interestin:

Thank you for your recent email to RNID. I am extremely sorry to hear about
the difficulties you are having at the moment with tinnitus. Recent
research, funded by RNID, was carried out recently in the US, this showed
that approximately 80% of people could change their tinnitus by various
different body movements. This may be a change in loudness or pitch of their
tinnitus. By using modern scanning techniques, researchers were then able to
look at the brain to examine what was happening. Certainly from this it is
possible to see movements in the body can affect tinnitus. As stress and
muscle tension may cause people to hold their body in a different position,
then there may be a link. This, however, would need further research.  More
on this research can be found in Tinnitus Focus ed. 25 on page 14. This
edition of Tinnitus Focus may be found at:

http://www.rnid.org.uk/information_resources/information_for_health_professi
onals/tinnitus_focus/archives_2004/

For the full paper, please click on the following link. Please note RNID can
not be held reasonable for information found on external websites:

http://epl.meei.harvard.edu/~ral/SomaticModulation.pdf

Ben  - as many as 80% eh?