What is the reason my ankle still hurts standing on that foot?

Condition analysis:
To know the answer to your pain issue i would have to figure out what kinda situation you were in when you first injuried it and how long it has been injuried to have got you this far your lucky what you were doing that caused the injury things like this your age it might be a good idea to get a ankle support this way it might be able to heal right or see your dr to see what shape its in.

Instructions:
Elevation: Elevation plays a key role in any home remedy program involving fractures, including fractured foot bones. Elevation involves lifting your injured leg so your foot is above heart level. Elevating your leg serves two purposes. Elevation helps return blood to your heart and decreases bleeding. Start elevating your leg while lying in bed or on a sofa by placing your foot onto a pillow or pile of pillows. Put enough pillows underneath your foot and calf area to lift your leg to the appropriate height.