To the left, to the left

The entire left side of my body is one giant mess. I've thought this for a while now, but this came up in conversation with KLo last night because of a shooting pain in the left side of my lower back.
My left eye's vision is about 2 points more negative than my right eye. I twisted my left ankle at around this time last year, and it still bothers me - it isn't nearly as flexible as my right, and flexing it tends to aggravate the muscles. I sprained my left wrist not too long ago, and I don't even know how I did it, but it too still twinges and aches (thank goodness I'm not left-handed, but typing tends to be problematic on my more achy days - such as today, the day before an essay is due).
And now, my back. I can't bend forward and I can't lean backwards, without sending a sharp jolt of pain through my lower back. I've popped two ibuprofen pills, since taking just one last night before bed did absolutely nothing. I hoped to sleep it off, but it's still very much there.
Which side of the brain is math-minded?