I think he should increase the dose of Asacol and use Rowasa enemas in conjunction with the steroid enemas. I agree with the dr about
avoiding pred but he's not taking enough meds. A lot of us take 4 Asacol 3x a day. I take 4 2x now. Call your GI and ask him why the dose is so low.
It sound to me like he has been in one long flare with bad days and good ones. I've never heard of a flare lasting a week or a few days. I had a flare that lasted a year+!! Many of us have. Not trying to scare you but it would be strange to flare so many times so close together in my opinion.
Blood is very common, gas, urgency, loose stool, cramps, fever, fatigue all go with the territory.
No one can tell you if it will get worse. If he has pancolitis, that's the worst case, the only thing that would be worse would be if it were extremely difficult to treat. It doesn't sound like it has been difficult to treat in the past. There are a lot of medical options
open to you. Please try not to stress. Support from your family makes dealing with UC a lot easier.
Do you have any relatives with UC? I don't but many UCers do.
Is he seeing a GI specialist or a regular Dr? Definitely go to a GI. Has he had a scope? Has he had stool tests?