im about to flip all the tables in the world, just trying to write a damn sentence. how can you stay calm? im about to blow a vein , its difficult putting my thoughts onto paper and im just finishing my 3rd cups of coffee
That's actually pretty simple. If it's your first draft, write it messy. Get the wording all fucked up. Not grammatical? Fine! All you need to do at this point is get down the gist of what you're trying to get across. Doesn't have to be pretty or even good. Hell, most first drafts are crap, why should yours be different?
Then when you've finished and given yourself a couple of days to breathe, go back and fix it on your second draft when you've had a chance to get some perspective. You'll almost guaranteed be able to write something better at that point. But for now? Let it be crappy, as long as the intent of the scene is clear.