My first official weightlifting injury! It only took 5 months! I'm not sure if I shoud be proud...

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Scenario: Leg press machine. Apparently, I misjudged how tired my legs were. Lowered the weight and it pushed my knees closer to my chest than normal. The angle of the push made my butt slide out from under me (forward) about an inch. I felt a *pop* in my lower back coinciding with a sharp pain. I pushed the weight up and got off the machine.
Since then: Periodic stretching, ibuprofen. Lower back is weak, stiff and hurts a bit. Wife (physical therapist) thinks I might have rotated a vertebrae.
Any suggestions?