(not) know if/whether (you) are coming or going

to be unable to think clearly and decide what to do because you have so many things to deal with.

I had so much to do yesterday that I didn't know whether I was coming or going.

The recent changes in the school curriculum mean that most teachers don't know if they're coming or going.

• be as old as Methuselah
• be as old as the hills
• be as plain as day
• be as plain as the nose on your face
• be as pleased as Punch
• be as poor as church mice
• be as pure as the driven snow
• be as quiet as a mouse
• be as regular as clockwork
• be as rich as they come
• be as right as rain
• be as safe as houses
• be as scarce as hen's teeth
• be as sharp as a tack
• be as sick as a dog
• be as sick as a parrot
• be as silent as the grave
• be as slippery as an eel
• be as snug as a bug in a rug
• be as sober as a judge
• be as solid as a rock
• be as sound as a bell
• be as sound as a dollar
• be as stiff as a board
• be as stiff as a ramrod