I've done something to my foot/ankle. I think its probably a sprain, but I don't really know how to tell 
I can't remember twisting it or doing anything particular to it. It's definitely been hurting since Friday, possibly longer.
It hurts if I press just near the knobbly bone on the inner ankle, and hurts on the front if I stretch my foot out. It hurts to walk on too, worst is going downstairs, sort of under my foot towards the heel.
When would you get it seen to? It's not agony, but definitely sore and doesn't seem to be getting better, in fact it's worse if anything. Any thoughts?