panic

[1]	be terrified/alarmed/fearful/frightened/terror-stricken/terror-struck , dread , fear , lose one's nerve , frighten , scare , (Colloq) go to pieces , fall apart , (Brit) lose one's bottle
[2]	frighten , scare , alarm , terrify , unnerve

[1]	terror , terror , affright , alarm , fear , fright , dread , horror , dismay , consternation , hysteria , anxiety , apprehension , apprehensiveness , nervousness
[2]	scare