My minecraft world CORRUPTED???????????

My minecraft world is like corrupted... you can only see well... its kinda the X Ray mod but like... creepier.. its like really bad i can't really describe it with words its that bad. D:(i dont even use mods) i reloaded the game twice and it is still the same. D: (NEW) well i restarted minecraft all together and it was fine after that but it still might do that again.
(new new) it well did it again... i cant seem to get it right.