jitters

from WordNet (r) 3.0 (2006)

jitters
    n 1: extreme nervousness [syn: {jitters}, {heebie-jeebies},
         {screaming meemies}]

from The Collaborative International Dictionary of English v.0.48

jitters \jitters\ n.
   an uneasy state; nervousness; as, the prospect of being
   drafted gave him a bad case of the jitters.

   Syn: nervousness, nerves, screaming meemies.
        [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

81 Moby Thesaurus words for "jitters":
      agitation, all-overs, apprehension, apprehensiveness, bluster,
      bobbery, boil, boiling, brouhaha, bustle, churn, cold shivers,
      cold sweat, commotion, conturbation, discomposure, disorder,
      disquiet, disquietude, disturbance, dither, dithers, ebullition,
      embroilment, excitement, ferment, fermentation, fever,
      feverishness, fidgets, flap, flurry, fluster, flutteration, foment,
      fume, fuss, heebie-jeebies, hubbub, hurly-burly, inquietude,
      jimjams, jumpiness, jumps, maelstrom, malaise, moil, nerves,
      nerviness, nervosity, nervousness, perturbation, queasiness,
      quivers, restlessness, roil, rout, row, seethe, seething, shakes,
      shivers, skittishness, stir, sweat, swirl, to-do, trembles,
      trepidation, trepidity, tumult, tumultuation, turbidity,
      turbulence, turmoil, twitter, unease, uneasiness, unrest, upset,
      willies