Hello, son seems to have lost his bowel control. He coughs, wheezes and…

Hello, son seems to have lost his bowel control. He coughs, wheezes and cries but nothing comes out properly. Sometimes with a teaspoon of tea, he has watery stools, not constipation. I've used a suppository a couple of times, but it's not working. I place pressure on my belly before eating, trying to evacuate, but it's useless. What advice can you give me? The doctor advised me to lie down on my stomach more often so that he would poop, but it's useless.