hi there, your history suggests that what you have sustained is most probably soft tissue injury
and not a fracture
but only an x-ray can rule out that. In the meanwhile you can take painkillers and anti-inflammatory tabs, keep your limb elevated after tying a crepe bandage over it and do not put much pressure or weight on it. You could also try cold
compresses. Walking or exercising the joint will make it worse and try to put as little weight on it as possible and use a crutch
for walking. After a rest of a week you could see the progress and if it is better then slowly start weight bearing, in case it gets worse in the next few days then you do need to see the doctor and get a x-ray done to rule out inter injury or a fracture. Take care.