Considering balance issues can have a multitude of causes, I post these links out of interest. As always, all caveats apply - make sure you see a decent practitioner.
http://www.pprune.org/forums/showthr...08#post1794508
http://audiology.advanceweb.com/edit....aspx?cc=93837
Great quote from the 1st link:
"if there is no biological cause,
it could be a stress symptom.
It can disappear for while and
then be back suddenly when you
do not expect.
It belongs to the whole psychosomatics
symptoms of stress.
It's a warning sent by the body to tell you
that it is enduring something it can't stand
anymore.
Very often, it's not the "something" that is
responsible, but the way you handle it"
Try Google for "jaw clenching, stress, imbalance" - a search string along those lines.
This info is no substitute for that of a Professional!