The most common causes of numbness and tingling in feet is due to diabetic peripheral neuropathy
,lack of VIT B 12,lack of calcium etc.
You must get yourself investigated for the above mentioned causes.
The treatment would depend upon finding the cause and treating it,along with injections of VIT B 12 for few days.
Since part of stomach and colon has been removed,then most likely the cause is deficiency of essential vitamins and minerals