Expressions (phrases, clauses, etc.)
not knowing what's what; being unable to make heads or tails
何がなんだか分からない。頭がパニックに陥って整理がつかない。I didn't know what was what. The inside of my head had gone to panic mode and I couldn't get things straight.
Also written 何が何だか分からない【なにがなんだかわからない】