A questions about foot injuries

[Nerva]

i was sparring with a guy last night and think i hurt my left foot. i was able to walk last night and stuff, but this morning when i woke up, just standing on my feet hurts. i walk with a limp now. i dont know how serious this is:

it's not swollen, if i press a certain spot, it hurts, if i don't it just hurts slightly. should i be concerned or is this something that passes?