17 Year Old Son Has Crohns. On Lialda And A

17 year old son has crohns. on Lialda and a steroid since October. this week he is constipated - since last thursday. learning of this, starting yesterday we had him drink alot of water and vegetables juiced in the juicer. last night gave him suppository. he said only a small amount of waste came out (about 20 minutes later). he is an athlete. it is swimming season. he is hungry. protein shake is usually what he has for breakfast. I've been slipping some miralax in the shakes and removed banana. sent him to school with 3 water bottles. anything else we can do? at what point do we worry? he tried to go this morning. could not. also had carrot and kale juice first thing this morning.