"Only questions you have hidden. If someone else hid it, it was hidden for a reason. I suggest reading the rules if confused to why it was hidden." - Yeah, Blob answered a part of it.
If you hid it, however, then you can go to the browser history (ctrl H) and pick out the link. Then just hit unhide. Or just save the link. If you can do neither of these things, then I'm afraid the post is lost.