I think they should take Clindamycin off the market. That's how I also ended up with C-diff after taking it for my third sinus infection. If Vancomycin doesn't work for you, please ask your doctor for Difficid. I know it's expensive but it's the med that worked for me after my 4th bout of C-diff in 2018. I've never been told that I will always test positive for C-diff. And be sure to start taking Florastor. My GI had me take it and it's a great probiotic for people who have or had C-diff or IBS. My heart goes out to you.