Hmm, you must have went haywire or something with an icon-hiding application, lol. If you download this app from cydia called "SBSettings" you can see which apps are hidden and unhide them. It should automatically restart after downloading it, then swipe your finger across the upper status bar to open it, press the "more" button on the left. After it loads up go to "hide icons"(the one with the poof icon next to it) and it should load up a list of what is hidden(off) and what isn't(on). Pick and choose from there, but if you don't see Settings in there you must have deleted it permanently somehow and you might need to restore
