hi there, it is highly improbable for an x-ray not to show fractures
, tho' soft tissue injury
may not be seen but an MRI
will be able to pin point to that. So if x-ray and MRI do not show any injury then probabley you have got some ligamental tear or sprain
which takes a long time to heal and is very painful, as they do not have any blood supply of their own. You need to use crepe bandages, rest with elevation of foot and antiinflammatory drugs for few weeks to get over it. Try to give the limb rest as much as possible. Take care.