Hi - I agree with Calgal - after a total colectomy, the normal symptoms are regular (~8+ times per day) watery motions. I overcame this by eating plenty of fibre in the form of pulverised fresh fruit and pulverised fresh vegetables to which bran had been added as well as home made muesli (oats, bran soaked in milk to which grated fruit/nuts etc have been added). Also drink ~ 2 litres of water per day.
Maybe you should try this type of higher-fibre diet - especially if there is a chance that your constipation actually results from too much "bland processed food" as well as a lack of fluid.
However, I do think that you ought to consult your doctor/surgeon as well.
Good luck
Morecambe
If you are eating somewhat normally, please contact your doc. With a total colectomy you probably should be experiencing very frequent, watery fecal material output.