My inventory has been wiped!

 I was on my mining journey, i closed Minecraft, opened it again expecting to go where i last saved the game, it even had the image of my last save, but to my surprise i spawn in the forest without any items or levels, (my house was still there) but all my diamonds and items i had when i was mining was all gone, i tried to close the game, open the game, go to my world which still had the image of my last save but i still did not have anything and respawned at the same forest, please can someone help me recover all the diamonds i had on my last save.