Why I don't see my question in the help room?

It's possible. Anyone with enough points is automatically a moderator. There's no training and the rules are a mess and out-of-date. Some people get confused and delete things from the Help Room which should stay there. The logs say you deleted almost all of your questions right after posting them, but I think there's a bug which sometimes does that when someone else deletes them. It's possible some new "helpful" moderator spent an hour cleaning up right when you were posting stuff. They're supposed to also leave a note, but they may not have read that part of the rules yet. Deleting Q's isn't very common, as you can see from the many "help me fix this error" Q's which haven't been deleted.