Might be a small crack that wouldn't have shown on an x-ray. Is there night pain? Is the pain on a joint? Can you see any obvious swelling or discoloration (bruising)? If so the joint might need some simple mobilisation to restore normal function. The later can cause pain down the toe.

If it was a crack there's not much that can be done except to rest from aggravating activities e.g. running, jumping and see how it settles down.