Just lost all my things like (Skins, packs, and worlds).

Ok so I've just got on to Minecraft, when I started it up it said the one of my skins could not be loaded. I thought nothing out of the ordinary cause it happens some times, but when I went to put it back on all it showed were two packs that came with the game. So I turned my Minecraft off then back on but still no luck. then I saw that all my maps and texture packs were gone to. If there are any ways to get them back I need to know I put a lot of money in to them, and some I truly loved.

If you can help I will thank you sincerely.