no appetite

give yourself some time, it might still be some pred withdrawal messing with you, that stuff is evil!
Also, i don't know why you had your colon removed or how sick you were before hand but it takes a while to get over that too.
Even if it was the first of january that's not that long to be recovered. I remember that there were times that i wanted to eat like crazy, and then days when i didn't want to eat at all, that lasted for a few months. I wish i didn't want to eat now!
If you don't have pain and you still have output then it's probably not a blockage, you could be dehydrated though, make sure you are drinking enough water. juices and sodas and stuff can actually dehydrate you more.

I was very sick from a uc attack surgery was best option.