81 year , my dad has Chronic constipation and stomach pains/ possible IBS

Hello,

I want to tell you how it started.

My mom expired in 2007 and my dad who is very sensitive and emotional in nature had a traumatic experience and was hospitalized for few days. He had constant pain in his stomach and didn't pass stool and also LOST WEIGHT.
Since then he is having stomach issues and it was them discovered that he has ulcerative colitis.
Since he has has build up and pain , he takes antacids and kayam churna tablets for constipation.
Recently he is visiting me in Canada and had an issue at night where he started getting pains at 1 am , he had his dinner at 11 pm. His stomach was bloated, hard and was having lot of pains. It was so much so that he was about to faint. I took him to the hospital and they did some test and it was found that there is blockage in his intestine. They kept him under observation and was later discharged after he passed stools few times and his pain subsided. His pain starts in the abdomen and goes up to his chest , he feels very hot in his stomach and his abdomen and gets frequent headaches as well.
I have also noticed that he has gone very weak and also lost some weight. He has lost muscles as well.
He loves salty and spicy food as well

He stays all alone and I am very worried about him. If you can please advise the remedy for the above issues, it will be very helpful.

Thanks