C-section and diarrhea/cramping

I had a c-section 5.5 weeks ago and since I left the hospital, I have had bad stomach cramps and diarrhea. Not just after I eat, but all day long. I saw a Dr. yesterday and he said it is either due to stress and/or from the antibiotics I was given in the hospital stripping my gut of the good bacteria and my body will take time to heal. He suggested Yogurt/Probiotics and prescribed me Zantac. Is anyone else having a similar experience and if so, what helped you? It has been difficult because it happens at random times and I can't just run to the bathroom all the time when I'm trying to care for my newborn son. I would have thought it would have gone away by now too.