何なにが何なんだかわからない

expression

not knowing what's what; unable to make heads or tails of something

Expresses confusion when a situation is chaotic, unclear, or overwhelming, making it impossible to grasp what is happening.

• 説せつ明めいが複ふく雑ざつすぎて、何なにが何なんだかわからない。

  The explanation is too complicated; I can't make heads or tails of it.

• 突とつ然ぜんの出で来き事ごとで、何なにが何なんだかわからなかった。

  Because of the sudden event, I didn't know what was going on.