It sounds like it may be gout which is a type of arthritis. Gout usually comes on without warning. The pain is described by many as being worse than the pain of childbirth. Gout is caused by an excess of uric acid in your blood. I have had gout on the top of my foot near my ankle several times. A simple blood test can determine if it is gout. I hope it is not the gout. Good luck!