My autistic son is 13 with his worse problems being related to sensory issues which keep him from eating a healthy diet/having a variety of foods due to texture/taste issues. Long story short, looking back he's probably been chronically constipated for years, normally having a stool every 2-3 days but never complaining about much discomfort. Six weeks ago he got the flu and was knocked out flat on his back for over a week. He went back to school and within a few days had horrible stomach pains coming home almost everyday. This went on for a week or so, I finally took him to a GP who said he was probably backed up from being reclined for so long. He will not take any of the medicines they recommended due to taste/texture. Eventually he refused to go to school. I've taken him to other GPs and ERs because his pain got so bad but they had little help/answers. One ER trip they found a medicine osmolax which is a macrogol that's completely tasteless that he will drink. We tried that at the doses they recommended for 10 days with little success--took him back and they recommended trying an disimpaction scheme from the ERIC website with a high dose of osmolax. We are on day 8 and it's mostly liquid but not completely. He still has stomach pain (much better than it was though) especially after eating. He still wants to lay around and it's difficult to get him to drink a lot of extra water after drinking 5 cups of medicine all day.
I guess I want to know how much like liquid his stool needs to be to stop (it sounds like explosive diarrhoea) and if he should still be having this much stomach pain if he was disimpacted? This is all been going on for so long and we are both exhausted and I just want him to stop being in pain. Thank you for any advice/help you can provide.