lost all progress :(

hi guys!! i have around 300 hours on cookie clicker, yesterday when i loaded the game everything was normal. however, today everything was gone, all my achievements, prestige levels and heavenly upgrades are gone, my run timer says 111 days when i've only actually owned the game around 40?? it's like I never played the game in the first place. i tried to reload a save from the steam cloud but it still just links to this current save where I have nothing. is there any way i can get it back? i did not purposely do anything to erase my save so i'm just really confused.