About 2 weeks ago I was waiting for the garden hose-reel to wind back up, when the wind caught the lid on the box it lives in, at the same moment I lent over to untangle the hose. It fell on my neck, missing my spine thank Goodness. It caught me on my neck behind my ear & knocked me to my knees & I must admit the air was pretty blue for a while as I realized I wasn't bleeding & not seeing double.
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This lid measures 28" x 36"
If you look real close you can see the flimsy hook just below the top right corner. 
Now I am keeping that huge heavy lid up with this big plank
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I have had awful headaches since but knew they weren't migraines & most of my days since the accident I have felt like I was hungover - not the nicest feeling in the world.
I saw my Dr yesterday to find out what was up & he tells me I have damaged a nerve that goes up the outside of the scull, so I am on some anti-inflammatory capsules that hopefully will heal the nerve.. But I am so happy it is not migraines & hopefully the headaches will start to go soon