I had similar issues after being on Remicade for a few years. It is possible that his flare is more than the current level of Remicade can handle. I went into a pretty good flare while on Remicade, and my GI chose to double the dose I was getting. I went from 400mg every 6-7 weeks to 1000mg every 8 weeks, and the problems mostly cleared up. Remicade, however, isn't a cure, so it is always possible to have active disease while on it.
Like the others have said, give the entocort some time to work.
Also, you might want to get a second opinion on your husbands treatment. It OK to do, in fact, my GI insisted on it after my last flare while on Remicade. Your health insurance should cover it, and it is a real good idea to just get someone with a fresh perspective to take a look at the overall picture.
I hope your husbands health improves soon.
Remicade, 6MP and a few of their friends.
"I'm just along for the ride."