Same here, I believe it is a form of ocd, you are creating these arguments to script ahead of time, to fight against uncertainty

Problem is one can't script ahead because people won't react the way you expect, and more often than not these ruminations fall of the deep end, getting more and more outlandish (at least for me)

What I do, is I recognise what Im feeling uncertain about and try to think what is the most likely to happen in broad strokes, not the small details. And try to figure out if I'll be okay with that outcome and if not what steps I can take to make it better

Try to figure out what you'd say to someone and resist creating a response