HI
Need to drink lots and lots of water, also when you think your colon is much shorter now and waste will get through much quicker,
It does take some time for your ssystem to get working again as it has it has being put through a lot. Do you take Dan Active that helps digestive system, and if I was you I would watch what I eat, and also if problem is so severe go back to Drs and tell them imodium is not working good, they can give you other stuff.
My wife has a bag where stool and urine goes in and is happy to have it as she was always running to bath room and sometimes did not make it.
Wishing You all the Best ..... Rob and Barb