Synonyms for Be beside oneself:

• v.

  •be angry (verb)
  • rage.
  •be uncontrollably angry (verb)
  • foam at the mouth.
  •foam at the mouth (verb)
  • run amok,
  • froth at the mouth,
  • run mad,
  • be livid.
  •rage (verb)
  • blow up,
  • make a fuss over,
  • have a tantrum,
  • rail at,
  • fret,
  • blow one's top,
  • storm,
  • let off steam,
  • tear,
  • go berserk,
  • champ at bit,
  • surge,
  • overflow,
  • fly off the handle,
  • snap at,
  • be furious,
  • throw a fit,
  • splutter,
  • scream,
  • erupt,
  • rampage,
  • work oneself into sweat,
  • blow a fuse,
  • steam,
  • bristle,
  • look daggers,
  • boil over,
  • rave,
  • chafe,
  • rant,
  • be uncontrollable,
  • fulminate,
  • scold,
  • rant and rave,
  • fume,
  • seethe,
  • yell,
  • roar,
  • have a fit.

• Other synonyms:

  •rage
  • boiling over,
  • going berserk,
  • throwing a fit,
  • blowing one's top,
  • raging.

Antonyms for Be beside oneself:

• v.

  • rage
    flatter, be happy, be quiet, compliment, praise, be calm.