I suggest you see a colon hydrotherapist for one or two sessions of colonic irrigation. If you never had one, this would be a good time. Any muscular weakness or restriction there can be due accumulated waste deposits. A colonic is not something you need to be afraid of. Colonics have been done by millions of people and been performed for hundreds and thousands of years. All it entails is the use of water to flush out out old waste matter. You should notice a difference in the anal sensations soon after your first colonic.
The area on the foot seems to be related to either the stomach or the colon. If the numbness subsides after the colon cleansing you will have ruled out ther stomach.