An overwhelming feeling of fear and anxiety WordNet 3.0 & Open English WordNet

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, uncertainty and frantic agitation consistent with an animalistic fight-or-flight reaction. Wikipedia

Sudden, overwhelming fear. Wikipedia Disambiguation

Sudden sensation of fear, which is so strong as to dominate or prevent reason and logical thinking Wikidata

Something that causes extreme or intense fear. OmegaWiki