As others have said....go easy...give yourself a break. Surgery takes the wind out of your sails...it will take a while to feel like you really want to dive in and organize.
When you are feeling stronger, do little things. Put a couple more shelves on your shelf unit, and find more baskets (maybe at a thrift store or garage sale) and throw things in there. Make a nice tag to add a description of what you just stored. When you have some extra money, go find something inexpensive that you can repurpose....and go vertical. Good luck.... it is always a process. SEnding healing thoughts your way!