There are other medications besides steroids. I took colazal for colitis but there are other anti inflammatory meds for colitis. You should talk to your Dr to inform them what's going on.
It's not unusual to have side effects from steroids! Some people have problems sleeping, weight gain, Reflux or GERD, nervousness, irritability, etc....... What dose are you on of the steroid? High doses usually cause worse side effects.
Do you take strong probiotics? A lot of people on these forms have recommended VSL #3. You can get it online without a script but if you want the strongest stuff, the double strength, it's prescription. Either way, it's often a good idea after you had a c diff infection to re populate your colon with good bacteria. It may prevent another attack of c diff.
Good luck to you.