Called 911. Went to VA. After eight hours, some X-Rays and a sonogram later, they sent me home with crutches, two meds I was already taking (that weren't wprking) and one new, and an ace bandage.
Got home, went to bathroom, and on the way back downstsirss, something went SNAP loudly in my knee. I spent ten minutes lying on the stairs, screaming in pain.
Back to ER. Still there now. Leg brace and mystifird staff, but also one injection. Beats me.