panic-stricken (adj.)

• afraid
• aghast
• alarmed
• appalled
• distressed
• fearful
• frenzied
• horrified
• horror-struck
• hysterical
• jittery
• jumpy
• nervous
• panic-struck
• panicky
• perturbed
• stunned
• stupefied
• terrified
• terror-stricken
• terror-struck
• unnerved
• upset