Hi - I had gotten colitis from taking Keytruda (an immunotherapy drug), not from taking chemotherapy. I did take both, at the same time and then just chemo separately. I was one of a very small percentage who got that type of side effect from Keytruda. My intestines became very inflamed so had to then take a steroid which helped to an extent but it persisted so I went to the hospital and was there for five or six weeks. Very painful for my stomach as well so had to take morphine to get through all that - lost a lot of weight - could not eat a thing. Eventually things cleared up as Keytruda does have a long half like so in other words even though I was taken off it the drug was still operating in my system.