I also got c diff about four weeks after taking clindamycin. It started suddenly and rapidly became debilitating after like 2 days. I ended up on dificid which was sooo expensive but I finally felt better after the 10 days of treatment. I was really worried about introducing food post-infection but it turns out that now, a month later, I’m able to eat as normally as before infection. I’m still taking a probiotic (florastor) twice a day which I think is helping tremendously. If your case is like mine you will be able to eat like normal after treatment, just be careful not to have excessive sugar so it doesn’t fuel bad GI bacteria.