For the next 3 days I literally couldn't walk; my knee was no more than a wet rope under my thigh. Searching online for my symptoms suggested an ACL tear; ACL tears are serious business and will not heal without surgery, which includes weeks of crutches, months of recuperation and up to a year of physical therapy and rehabilitation.
Even with arthoscopic surgery the prognosis for complete recovery is nowhere near 100% (especially at my age). So I wasn't surprised when my doctor said I should get an MRI right away.
But I live on a boat about the size of a bathtub and the prospect of not walking again, at least without a severe limp, much less ever running ... asserted itself as a very real proposition.
We'll talk about pain in another minute.
Close yourself into a space about the size of a minivan for three days' worth of staring at the walls and ceiling as often as you like. You'll have no trouble making a long list of all the bold new things you find about about yourself.
And about your faith, too.