Thinking about beforehand is the worst, isn’t it? I had different surgery, different body part, same anxiety!
If you can, spend the time preparing for what you need after surgery. It may keep your mind busy.
Check that you have something to hold on to ass you walk through the house - counter, back of sofa, wall. I’d guess dizziness or balance may be an issue for a few days.
Maybe plan on only button down shirts so you don’t pull anything past your ear. Move as many important things up on a counter or table so you don’t lean over (hair tools, kitchen appliance, whatever is in the lower drawer that you use daily).
It may be relaxing to put a headphone earbud in the good ear and listen to music or book as you sit. The strain of listening temporarily with only one ear can be tiring - you might not even notice, but your brain will be working harder to compensate.
Best wishes for tomorrow!