hyperacusis, myoclonus, SID, involuntarily shuddering on loud noises and going down hills?

Either neurological or psychogenic. Definitely see a neurologist. I am not sure of the neurological significance of hyperacusis, myoclonus or SID. Doesn't SID have a neurological etiology??

I would rule out neurological manifestations before entertaining psychogenic causes (perhaps, situational anxiety or a phobic response). Even in light of the fact that "distraction" helps ease symptoms doesn't necessarily imply a psychogenic problem. Part of the issue may be symptoms that have developed as a conditioned response to an unresolved underlying neurological problem. Symptoms masking (and as an effort to adapt to) other symptoms.

If symptoms are affecting your ability to function on a day-to-day basis and there is a wait to get in to see a neurologist, perhaps treating the symptoms might not be a bad idea for the short term. Desensitization training may help in the in term, maybe Ativan would help situationally?? Hypnosis could help as well (i.e., guided relaxation by an QUALIFIED professional)...

EDIT: You may also want to look up migraines with aura. Do you get a headache within 24 hours of these reactions?? Have you kept a diary of your symptoms?? Could be a good thing to do so that you can have a record to show the neurologist.

May want to look up aura without migraine, as well. Just anecdotally here, auras do not necessarily result in migraine. They sound a little like what you describe.

I know that migraine sufferers are often people who get 'motion sickness'. I also know that what most people *think* are migraines, aren't migraines at all.

You could also try posting your question in the "Medicine" section. Actual MD's, like Mdgreg C, who has answered your question above, can be found 'hanging out' in that section.

First of All, I don't Know the Basis of you Problem. it has to Have Some Basis, is There Pain Associated With this? Are There any Other Manifestations (Not Mentioned Above)? Any Drugs Which Give you Some Relief? Not to Leave you With Nothing, See Migraines, Perhaps a Neurologist Could Help you.

Tearing Fabric

Try a different class of music and carrying something when you walk down hill. Do something different to change your usual thought pattern about the events.