My wordpress site post deleted automatically

hi, i am using wordpress from last 7 or 8 years, and today i have faced biggest issue of my life with wordpress, all my wordpress post are deleted and i could only see one or two latest posts, i am not sure if it was some wp bug, my competitor attack or ftp hack, i am investigating with my host too, if any one can help me with issue it would be a big help, site in discussion is thepressreelase.org