Game Took Away My Items

i saved my game to get off and when i got on i lost everything i had on me and In my Ender chest i had 2 diamond pickaxe my diamond sword and all my enchanted stuff on them. i worked so hard for my things and im genuinely uspet. becaue i was mining diamonds and lost 57 with everything else. i know theres probably nothing you can do but im reporting this bug and hope you guys fix it so it doesnt happen to anyone else