Trust me, these insane theories about the universe and the idea of existence in general haunt me every second. There are 0 answers to these questions, literally, I've tried, no matter what - the rules of the universe are arbitrary and you cannot prove that you're not in a simulation but the funny thing is these questions apply to the universe above us (If there is one) about the reasoning for their existence, the cure sorry to say, is just to stop thinking about it or get into the habit of preventing yourself from going down the rabbit hole every time it starts.