Hi and welcome. First, yes, he needs to find a good GI and get started on some treatment. A good game plan always makes me feel better. And Asacol could help him, won't know until he tries....and I have not one side effect from it.
Also, maybe while he's feeling bad you all can do some things and stay in. Rent movies, have a game night or something? I enjoy when I can just relax at home when I'm having a bad day and do enjoyable things here in my house.
You might have him check into probiotics...you'll see numerous references to them here, many take one. There are tons of different kinds but different ones for for different people.
That's the thing with this disease, it's very individual.
Best of luck to you both.