Having had several episodes of DP throughout the last 15 years, these thoughts always top the list of intrusive mind games.
You will become free of them, I think we question everything because of the state we are in, believe me, I think I've questioned everything. What used to get me is that half of it you can't answer and then panic would set in.
You see your neighbour putting out his bins? Do you think he's questioning why the grass is green? Nope. Just laugh it off and carry on and these will be subside over time