Zonked

I don't know if there is a word called 'ZONK'. I (We) use it to represent a state of indisposition when you don't expect the condition to improve soon. Usually we tend to associate this word with elderly patients who have big time problems when it comes to fitness for surgery. But right now, I'm using it for myself. I'm zonked. I am very sleepy and I'm very tired. And I'm getting scolding for everything I do (and I don't).