Hello and welcome to HCM,
To summarize all your problems- You have had colectomy
(?for malignancy) and J pouch, thyroid
medication, discharging belly button and pain in the hips, most probably due to herniation of the L5 disc.
Amongst your symptoms the most alarming seems to be the discharging belly button.
Kindly, see your doctor for examination of the belly button.
In case, there is some kind of swelling at this site, a FNAC/ biopsy
can be done.
This could be due to metastasis from the previous curgery (colectomy).
The herniation of the L5 disc requires conservative management- bed rest
for prescribed time period.
Thanks and take care
Dr Shailja P Wahal