To that point of order, Chair, when someone takes the chair in the place of the original chair, then that person has to act as chair. If he wants to speak, he has to step down from the chair and pass the chair over to somebody else.
I don't think you can be the chair and deal with points of order, particularly ones that are dealing with your right or ability to ask questions at any given time. You would have to cede the chair to somebody else and step aside from the chair while you're asking questions.
Seeing as you're trying to perform both functions at once, I think it's out of order.