I have pain on the top of my foot - cany remember knocking it or tripping?

It hurts more when I place my foot flat on the floor but if i tip toe it dosent seem as bad. The pain started a few days ago when I just stood up and found I could not walk on it for a few hours. I can walk now but it is incredibly painful. Have tried heat pads but made no difference. Any ideas? It seems daft to go to see a doc when I can walk even though I look daft!!! Cheers, in anticipation