probiotic question... any doctors or nurses here?!

I am almost 5 months pp, I developed a UTI after having my daughter vaginally which I thought was treated with a round of macrobid, then when she was almost 3 months old I went to the ER with severe back pain and urinary symptoms. I don't believe the first UTI ever really went away. I was then put on macrobid again... Which in hand did not work, then keflex, Bactrim, and last but not least cipro.... Which leads me to my question.. My doctor believes I've developed c. Diff now in return (I'm only 19... Going on 20 in December) a month after I finished cipro I started feeling like I was about to have the stomach flu... Then my diarrhea started to have blood in it. My PCP immediately put me on flagyl I was fine for about two weeks until I really I'd get the stomach flu...then I started having diarrhea again, no blood, but stomach burning and a pain that would come and go in my upper left stomach, below my breast bone. Anywho, doc made me give a stool sample (should have the results tomorrow) and put me back on flagyl. But I'm constipated... And have been for about two days.. I thought with c diff you had D. But I was wondering is it ok to take two probiotics together...? I already take renew life, was wondering if I could add in florastor. I also started eating activia. Just wondering if I could take both at once and if y'all have ever had to deal with this and some ways to help fight it off