My stuff dissapeared when I dropped them to the floor from the inventory

I was accommodating my stuff in the chests, I wanted more space to do that so I dropped my stuff from the inventory to the floor( not from the chests), five minutes later I look where I left them, and they were gone... Please do something about it.. I want my stuff back, is there any way to have my stuff back?... I had like 35 diamonds that took me a long time to find, I had 64 blocks from iron I had one diamond pick axe and lots of coal... And more stuff I want them back