panic -
sudden mass fear and anxiety over anticipated events; "panic in the stock market"; "a war scare"; "a bomb scare led them to evacuate the building"
Panic is a sudden sensation of fear which is so strong as to dominate or prevent reason and logical thinking, replacing it with overwhelming feelings of anxiety and frantic agitation consistent with an animalistic fight or flight reaction. Panic may occur singularly in individuals or manifest suddenly in large groups as mass panic (closely related to herd behavior). The word panic derives from the Greek πανικός, "pertaining to shepherd god Pan", who took amusement from frightening herds of goats and sheep into sudden bursts of uncontrollable fear.
OmegaWiki Dictionary
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panic To be overcome by a sudden fear and lose control.