I had ankle sprain since last october. i stepped on other's foot during a basketball game. nothing serious from x-ray report. how could i recover?

Quickly: proper bracing to protect the tendons while you heal and anti inflammatories should resolve this in a few weeks.

MRI: although the x-rays are normal an MRI might reveal that something else is happening. Ask your physician about an MRI or a consultation with somebody who has expertise in the feet. There are soft tissue injuries that do not show up on x-ray