Actually you want your body to continue eliminate waste. The last thing you want is a state of toxemia. And no i don't think he means bowel movements. He said himself that it was his bladder and to urinate.
when you say you go to the bathroom, do you mean to have a bowel movement or to urinate?
I assume you mean BM or why would you be talking about seeing a Gastro? In that case, yes, that is a bit much, but if they are normal BM, no pain or diarreah; and if you arent feeling tired or lack energy, then yes, it is normal. Just means you have a fast metabolism. I assume you are probably pretty thin? Going that often may be annoying, but I guarantee that most of the ppl in this forum would trade places with you. Going 2-4 hours is better than 2-4 days.