First - diarreha and stomach cramp for five days. doc tested for everything and nothing appeared a month later, irregular bm and pain lower right back?

Maybe not related?: Perhaps the two presentations, a month apart, are unrelated. On the other hand, your various symptoms may early indicate a problem. The only way to know is to pursue directed studies. Ask your doctor, who knows you best, what suspicions he/she may have, and how they'd like to proceed. No diagnosis here is possible based on the limited background and context you've provided.