Ouch. That *is* bad. Your description reminds me of how I felt
  in school. I'd get a thought in my head and it wouldn't go away.
  People looking even close to my direction were distorted; always
  negative and judgmental or mocking in some way. I'd get nausea,
  tunnel vision. My mother said I'd get into inconsolable states.
  [I was talking with Jay about this earlier, so he gets a repeat]

  At 11, my mother took me to biofeedback. I learned to "breath
  through my feet" / "be a bottle in the warm sand". There were
  these tapes of guided meditation and I had to control a
  computer's beeping with my mind and make the tone go down in
  frequency and volume.

  [this was back in 1983 when biofeedback was considered a bit
  quackery. She also fed us homemade yogurt a lot, which wasn't
  half bad].

  Anyway, it worked. Breath in for 6 seconds, breath out for 6
  seconds. That's the gist of it in a nutshell.

  Didn't cure the anxiety problem but it gave me my first handle
  on it - something I could _do_. I picked up vipassana meditation
  at some point, found other outlets like manic piano playing or
  fast typing.

  I did recently find that magnesium + zinc (regular amounts) were
  a big help; my body reacts to it the same as it did when I had
  Lorazapam (atavan?) in my mid-20s. Occasionally I'll use it even
  now.

  Sounds like you have it far worse than me though.