Sudden sharp pain on top of/lateral foot?

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I'm 29 years old, was a 2 sport college athlete. Currently have 2 kids, work as a nurse, not much strenuous physical activity. ANYWAYS. For about a few months now, I will be walking and out of no where, I get a sharp, shooting pain on the top of my foot(more lateral than medial) near where my foot connects to my ankle. I could literally fall to my knees when it happens. Then I usually end up limping and walking flat-footed and it'll eventually go away after minutes or a few hours. Now, sometimes this happens multiple times a day. Other times, it won't happen for weeks. And I'll be feeling completely normal. As of lately it's been happening more and more frequently. No significant injury noted. No swelling or bruising. Slight tenderness upon touch. I had an xray taken today, everything looked "fine". I go in for an MRI next week. Any thoughts on what could be going on? Why so intermittent? Will the MRI show anything if I'm not having any symptoms currently?