struggle, suffocate, jerk, fidget, fuss, tense up, stiffen, wring (one's hands), smolder, quaver, pace, speculate, lose focus, fixate, concoct, trip up, lose control, micromanage, obsess, ratchet up, pump up, fear, dread, replay, work up, fret, lose sleep, weigh one down, distrust, warn, caution, agonize, play with (one's hair), jitter, catastrophize
flex, squeeze, mangle, jerk, slide, thumb, toy with, tap, scratch, fiddle with, fumble, squirm, twist loose, play with, jiggle, wring one's hands, bob, bounce (one's leg), twitch, twiddle, wiggle, fool around with, fret (a hole in one's napkin), smooth (something with one's hand), rock, shift (one's weight), wriggle, twirl, fidget, fan, wind, brush off (one's clothing), pull at, tinker, twaddle, ripple, worry (something with one's hand), swivel, bother, shimmy, flounder, fuss
grip, clench, clasp, clutch, constrict, choke, scrunch, twist, pinch, contract, tighten, fumble, draw oneself up, sweat, perspire, brace, freeze, freeze up, tense up, coil, bite (one's nails), pick at, flare (one's nostrils), drop, stiffen, bristle, stammer, stutter, falter, hem and haw, fold and unfold (one's arms), shred, hesitate, splutter, quiver, trail off, wring (one's hands), grind (one's teeth), quicken (one's speech), rise, overuse (force), purse (one's brow)