Baby has lost of stools and low appetite

My 1 year old has been pooping 4-5 times a day for the past 4 days. It looks yellow and smells really bad (it looks a little loose but not too watery) Also, he hasn’t been eating much like he always does. He was very sleepy yesterday and slept most of the day. Today he hasn’t really been too active. He will play for like 5 minutes and then will come crying to me. I don’t want to go to his pediatrician because they never really help me with anything. Every time i go they always tell me he’s ok and there’s nothing wrong with him. And they only check his temperature, heart rate, check hid ears. So i don’t want to waste my time going. But what worries me is that he’s not eating and his yellow stools. Could there be something wrong? Should i take him to the ER?