I had two bouts of diarrhea last month

I had two bouts of diarrhea last month. The first diarrhea was self limiting. Two soft and loose bowel movements  only but it resulted to systemic inflammation (CRP +). I was given antibiotics. Should I blame this to milk tea or the dimsum?

One or two weeks later, I had another bout of diarrhea. It was watery. I was worried of getting dehydrated. I cannot keep up with the fluid balance. It seems to me that the rate of liquid output was greater than my fluid intake. I was boweling like a toilet flush. Luckily, after seven times it stopped. My fecalysis showed that I had amoebiasis. There were rbc and pus cells in my stool. I was given metronidazole. Few days later, my stool culture had positive growth of citrobacter. Ouch! How can I be so unlucky?  Was it a lab error? Is Citrobacter very virulent? I refused to take another antibiotics.  I fear too much antibiotics will result in yeast infection - candidaiasis. I told my obgyne, I wanted to wait and see.