Thanks for writing in.
From your symptoms, it could be gout
, stress fractures
or simply trauma. While the possibility of gout exists, it can be ruled out only by a complete physical examination and an aspiration from the swollen joint.
In the case of a stress fracture, too much of physical activity can cause an injury
to the metatarsals ( the long bones at the base of the toes). This can lead to a fracture.
I would suggest you see an orrthopaedic surgeon for a complete evaluation and a Xray of the right foot ( both AP and lateral views would be needed)
Hope this helps.