Bad pain, no swelling

Based on the limited information provided; I have no idea what it is and what you should do.

 

Hello.

By going over your foot you mean you stepped on it? Injuries don't always manifest with swelling. Although a lot will manifest with tissue tightness (that's how are body tissues usually react to pain, they tighten and contract more). Resting and icing it can help, but it's not everything. Resting helps the tissues recover and icing prevents pain and swelling. The thing is, if the source of the discomfort is still there, the pain or discomfort will keep on coming back then.

Now what could the source be? Based from your story, a possibility might be that one or more of the bones in your foot got malaligned due to the trauma. There are a bunch of bones in our feet, different sizes, some long and large, some small. They're all structured to fit and work well with each other. Now if even just one of them got out of place, it affects the whole biomechanics of the system, the movement, etc. It affects the near surrounding parts first, then eventually spreads further.

Another possibility might be a minute ligament or tendon or muscle trauma. This could have happened primarily or as a cause of a bone malalignment, since ligaments and tendons attach to bones, and muscles attach to ligaments.

Resting and icing helps, but you still need to fix the source, that is, check for malaligned bones, etc. And you will have to end up mobilizing them (or have them mobilized) to put them back into alignment and put everything back into their proper places. That's my take on it.

Any further questions, just ask away. Remember, hit the source of the problem.