I see how this was an important event in your life, and worthy of an essay. And I can see how, if you write it well, this essay could be a great addition to your application.
BUT (and there’s always a “but”)-- know that it very likely won’t be unique. As sad as it is, any number of kids have had roughly similar experiences and will also write about them for the same reasons. There will be a good number of kids who will write about the concussion they had this year and how it impeded their ability to do school work and read from a screen. There will be the kids who write about radiation and chemo. There will be the kids who missed their Varsity season because of knee or ankle surgery. I can name 4 or 5 of the Seniors I taught this year who could have written an essay roughly similar to yours.
I’m not saying not to write it. By all means, write it. But then write – or at least play with-- a few more essays, ones that focus on smaller, less life-altering events. You have a whole summer, and that’s a remarkable gift for Juniors in particular. It gives you the time to consider alternatives, to write the essay that has the best chance of “giving them a reason to say yes” to your application.